A rotating cast of guys and dolls in front of a Washington, D.C. building.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A wondrous old library overlooking the nation's capital.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

This grand gothic brewery has been pumping out suds for over a hundred years.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Home to items never before seen by the public.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A museum dedicated to the history and art of staying clean.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Countless grotesque faces stare out from this eerie Prague art wall.

One of the oldest, well-preserved water treatment facilities in all of Europe.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Microscopic scenes; some call it novelty, some call it art.

This artificial cave looks like something out of a fairytale.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”