Smithsonian National Museum of Natural History

In 1958, Harry Winston shipped the most famous diamond in the world to the Smithsonian Institution in a plain brown package sent by registered mail. The Hope Diamond, 45.52 carats and the largest known blue diamond on earth, arrived at a museum that charged no admission and was open to anyone who walked in off the National Mall. That combination, extraordinary objects made freely available, is the proposition the museum has been making ever since.

The Smithsonian National Museum of Natural History on Constitution Avenue holds more than 146 million specimens and artifacts, making it one of the largest natural history collections on earth. Most of it is never on public display: the public galleries represent a small fraction of what sits in research storage. What is on display is substantial, and a full day is the minimum needed to see the main permanent galleries without rushing.

Admission and hours

Entry is free. The museum opens daily at 10 am and closes at 5:30 pm, except on December 25. Timed-entry passes are not currently required for general admission, though they can be reserved in advance on busy days in summer and around school holiday periods. Arriving at opening on a weekday morning gives the best access to the most popular areas, particularly the Janet Annenberg Hooker Hall of Geology, Gems, and Minerals, where the Hope Diamond draws the longest waits later in the day.

The Hope Diamond

The diamond’s history starts in the 17th century at the Kollur Mine in what is now Andhra Pradesh, India. French gem merchant Jean-Baptiste Tavernier bought the rough stone there in 1666 and sold it to Louis XIV of France in 1668. The French Blue, as it was then called, was stolen from the French Royal Treasury during the Revolution of 1792 and disappeared for roughly twenty years before re-emerging, re-cut, in London. It appeared in an 1839 gem catalogue belonging to the Hope banking family, from which the name derives. The curse story, involving misfortune falling on anyone who possessed it, was largely invented or heavily embellished by jeweler Pierre Cartier in the early 20th century to increase the stone’s mystique among wealthy buyers. It worked as a marketing strategy. Winston purchased it in 1949 as part of Evalyn Walsh McLean’s estate, donated it to the Smithsonian in 1958, and the mail parcel it arrived in reportedly cost $2.44 in postage with a million-dollar insurance policy attached.

In April 2025, Harry Winston’s son Ronald Winston donated the Winston Red Diamond and the Winston Fancy Color Diamond Collection to the museum. The 40 stones, graded as “Fancy color,” are now displayed alongside the Hope Diamond in the Harry Winston Gallery, creating arguably the most impressive gem display in the United States.

The rest of the museum

The David H. Koch Hall of Human Origins covers six million years of human evolution, from the earliest bipedal ancestors through the emergence of anatomically modern humans. It is one of the better-designed science exhibits in Washington, written at a level that works for adults rather than being solely pitched at children, and regularly updated as new research changes the picture.

The Deep Time Hall, the museum’s reconceived fossil halls reopened in 2019, covers 3.7 billion years of life on earth. The central display is a Tyrannosaurus rex skeleton in a predatory pose and a Triceratops in a defensive stance, presented as a confrontation scene. Whether that dramatic staging accurately represents how these animals interacted in the Cretaceous is contested among palaeontologists, but it is a compelling piece of exhibition design regardless.

The Ocean Hall holds a 45-foot model of a North Atlantic right whale suspended from the ceiling. It is one of the rooms that children tend to remember longest, and the marine invertebrate and coral displays surrounding it are more scientifically detailed than most visitors expect.

The Butterfly Pavilion, a live tropical greenhouse with hundreds of free-flying butterflies, requires a small separate admission charge (around $7 for adults). It is the only paid component of the visit and worth it for the experience of walking through a space where the insects land on visitors. Arrive early; the pavilion can reach its visitor capacity by mid-morning on weekends.

As of 2026, the museum is running a new permanent exhibit on the American bison, tracing the species from its deep prehistory through the near-extinction caused by 19th-century commercial hunting to the current recovery. With an estimated 30 to 60 million bison living in North America before European settlement and fewer than 1,000 remaining by 1889, the bison story is one of the most dramatic ecological collapses and partial recoveries in American history.

Getting there and nearby options

The museum sits on the National Mall between 9th and 12th Streets NW. The closest Metro station is Smithsonian (Blue, Orange, Silver lines), a five-minute walk. L’Enfant Plaza station (Blue, Orange, Silver, Green, Yellow lines) is slightly further but also walkable. The National Mall does not have convenient parking; public transit or walking from nearby hotels is the practical approach.

The museum has a cafe and food court inside for lunches and snacks. Neither is exceptional, but they are convenient. For better food, the Penn Quarter neighbourhood immediately north of the Mall has a dense concentration of restaurants at various price points. Rasika, the acclaimed modern Indian restaurant, is a ten-minute walk; so is Jaleo, Jose Andres’s Spanish restaurant that helped transform the neighbourhood in the 1990s.

Nearby hotels

The Hay-Adams on H Street, overlooking Lafayette Square and the White House, is the prestige option for the area, with rates reflecting its history and location. The Renaissance Washington Downtown on K Street is mid to upper range and well positioned. For something closer to the museum on the Mall end, the Mandarin Oriental near the Tidal Basin is a 15-minute walk and has a strong restaurant.

Practical notes

Washington operates on Eastern Time (UTC-5 in winter, UTC-4 in summer). Summer months, particularly July and August, bring significant crowds to all Smithsonian museums. The museum’s size means it never feels as overcrowded as a smaller institution might, but the Hope Diamond room can be uncomfortably busy between 11 am and 3 pm on summer weekends. The building itself, opened in 1910, has no air conditioning issues in summer as the central atrium disperses heat; bring layers in winter when the marble floors and high ceilings can make the galleries feel cold.

The museum is fully wheelchair accessible, with lifts to all floors and accessible routes through every major gallery.