The oldest U.S. Government building in California, and it's State Historic Landmark #1.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

An original apothecary from 1792.

A former major munitions plant that has been converted into a sprawling art space.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The maritime museum that boasts the largest nautical library in the western hemisphere.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Secret North Korean passage discovered below the world's most dangerous border.

Home to more than 13,000 pieces of war memorabilia and military equipment.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.