A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

More gold than anywhere else, ever.

New York City's smallest piece of private property.

A hip bar decorated with walls of golden skulls.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

Nikola Tesla's former home contains an homage hidden from plain sight.

A very classy 1920s-era bar right in Grand Central Station.

The "Seinfeld" diner.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

Art Deco urban decay at this historical building.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

A former fortified tower now houses a collection of classic communications equipment.

Fluffy and friendly alpacas nestled against the border of the beautiful Connemara region.

An abandoned faux-pub made famous by a Guinness commercial.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.