One of the few of its type in the world, this museum showcases hotels and business.

One of America's oldest continuously operating hotels offers a blend of rich history and historic architecture in the heart of Annapolis.

This 12th-century castle majestically overlooks the city and the beautiful Mosel River valley.

The remains of a 13th-century Norman fortress, largely destroyed by an explosive renovation.

Two columns and a path leading into the woods at Fort Bennett Park are all that remain of a custom-built, Bavarian-inspired castle

This 18th century mansion played Winterfell in Game of Thrones.

When the water level in the Danube in central Budapest is low enough, there is a secret site telling the history of one of the most iconic bridges of the city.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

The only Chicago bridgehouse open to the public contains a museum devoted to the Chicago River.

The only dome home to be owned or occupied by dome inventor Buckminster Fuller.

A masterpiece of Rationalist architecture in the center of Madrid with lizards on it.

These vibrant row houses are a unique example of Baltimore kitsch.

This nondescript row house in downtown Washington, D.C., was the home of a very secretive group for well over a century

The oldest Anglican church in Central America hosted the coronations of four indigenous kings.

The bell of HMS Hood is rung every Sunday at this ship-themed church.

A cemetery and stairs are all that remains of this former church

Vermont's hills are alive with the sound of music at this historic hotel.

The birthplace of a tobacco empire.

The former home of the "Father of Black History"

A trompe-l'oeil fresco celebrating 250 Walloon figures who left their mark on the region.

The first federal construction project authorized under the Constitution

Showing films since the silent era of the 1920s, it is now the last movie house in downtown Newport.

A botanical hideaway sits inside the ruins of a half-built Civil War fort.

A centuries-old stone pagoda from Japan stands among cherry trees beside the National Mall Tidal Basin.