Diana, a statue created by sculptor Augustus Saint-Gaudens in 1893, stands atop the stairs in the Philadelphia Museum of Art's Great Stair Hall.

A dense crowd of people always surrounds Leonardo da Vinci's Mona Lisa in the Louvre Museum in Paris, France.

Cindy, a historical presenter, is illumunated by window light as she sews after completing her chores at Daggett Farmhouse in Greenfield Village, part of The Henry Ford museum, Dearborn, Mich.

A quote from "The Aeneid" by the Roman poet Virgil spreads 60 feet across 2,983 blue watercolor squares in the Memorial Hall of the 9/11 Memorial Museum in New York City. Each watercolor square in the work by artist Spencer Finch represents a victim of the Sept. 11, 2001 terrorist attack on the World Trade Center and an earlier attack on Feb. 26, 1993.

The hallway on the top floor of the Smithsonian's National Portrait Gallery in Washington, D.C., Is surrounded by a balcony with additional exhibits.

A portrait of Ben Franklin has a prominent position in an alcove of the Smithsonian's National Portrait Gallery in Washington, D.C.

"Virgin and Child Enthroned and Donor, Angels," created by Italian artist Pietro Lorenzetti around 1319, is framed by an archway in the Philadelphia Museum of Art.

A skylight provides ambient light to the top floor of the Smithsonian's National Portrait Gallery in Washington, D.C.

A vintage lightbulb provides light in Thomas Edison's Menlo Park Laboratory in Greenfield Village, part of The Henry Ford museum, Dearborn, Mich.

Washington Crossing the Delaware, a painting by German artist Emanuel Gottlieb Leutze, dominates a wall in the Metropolitan Museum of Art in New York City.

The Smithsonian Institution Building, commonly known as the castle, stands on the south side of the National Mall in Washington, D.C. The statue in front of the building honors Joseph Henry, first Secretary of the Smithsonian (1846-1878).

Visitors ride down Bagley Street in a Model T Ford in Greenfield Village, part of The Henry Ford museum, Dearborn, Mich.

Plants in the Enid A. Haupt Garden at the Smithsonian Institution in Washington, D.C., brighten the walk to the Smithsonian castle housing the museum's information center.

The facade of the Palais du Louvre can be seen through the glass from beneath the large glass and metal pyramid that serves as the entrance foyer for the Louvre Museum in Paris, France.

Canned goods and canisters line the shelves of the J.R. Jones General Store in Greenfield Village, part of The Henry Ford museum, Dearborn, Mich.

Museum visitors gather around Venus de Milo, a sculpture created sometime between 130 and 100 BC, in the Louvre Museum in Paris, France.

Artwork and sculptures decorate the ceiling of a room in the Louvre Museum in Paris, France.

A couch fills a common area in Grünes Gewölbe (Green Vault), a museum in Dresden, Germany.

A long room inside the Louvre Museum in Paris, France, is filled with art beneath an ornate ceiling.

Blades from the Farris windmill stand against a blue spring sky in Greenfield Village, part of The Henry Ford museum, Dearborn, Mich. The windmill is thought to be the oldest surviving windmill in the United States. It was built in the mid-1600s and operated in Cape Cod, Mass., using the wind to operate grain milling machinery. The windmill was purchased and moved to Greenfield Village in 1935.

The Staircase Group, a double portrait painted by Charles Wilson Peale in 1795, shows his sons Raphaelle and Titian. The portrait is painted in the trompe l'oeil style, an art technique using realistic imagery, like the step in the foreground, to create the optical illusion that the depicted objects exist in three dimensions.

Artwork and an ornate ceiling rise above windows in one of the rooms in the Louvre Museum in Paris, France. The museum building was originally constructed as a fortress in the late 12th to 13th century. After the fortress lost its defensive function it was converted in 1546 into the main residence of the French Kings. During the late 1700s the building was decreed to be used as a museum.

Museum visitors walk past Michaelangelo's Slave in the Louvre Museum in Paris, France.

A dense crowd of people always surrounds Leonardo da Vinci's Mona Lisa in the Louvre Museum in Paris, France.

Spiral walkway leading to skylight, Guggenheim Museum, New York City.

An ornate ceiling rises above one of the rooms in the Louvre Museum in Paris, France. The museum building was originally constructed as a fortress in the late 12th to 13th century. After the fortress lost its defensive function it was converted in 1546 into the main residence of the French Kings. During the late 1700s the building was decreed to be used as a museum.

Winged Victory of Samothrace stands above a stairway in the Louvre Museum in Paris, France. The statue was created about the 2nd century BC and was discovered on the island of Samothrace, a Greek island, in 1863.

The nose of a British Airways Concorde comes to a sharp point against the background of a deep blue sky. The Concorde is on display on the flight deck of the aircraft carrier Intrepid at the Intrepid Sea Air & Space Museum in New York City.

Doorways frame artwork in the Timken Museum of Art in San Diego's Balboa Park.

The Thinker by sculptor Auguste Rodin in front of the Rodin Museum, Philadelphia.