This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Delaware's first railroad lasted only five years and spanned only 16 miles, but its ticket office has survived for two centuries.

Many of the most significant figures in American history once hopped on a stagecoach in this alleyway on their way to more noteworthy destinations.

This 17th-century place of worship still celebrates holidays in the traditional Swedish fashion.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Experience the pivotal Civil War battle at this interactive museum.

The site of the daring river crossing that changed the course of the American Revolution.

Sleep in a Frank Lloyd Wright-designed home or dine in the treetops in this architecture park.

A secret, ethereal waterfall beneath the picturesque gardens.

Tucked into Pittsburgh’s North Side, the Mattress Factory is a labyrinth of permanent, room-sized installations where artists transform entire spaces into mind-bending, immersive worlds.

The Fabric Workshop and Museum showcases fabric and mixed media work by artists of great international renown as well as local and outsider artists.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

A diorama of the Civil War, fought by cats.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.