Try not to get slimed in Tribeca.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

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

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

A former connection to City Island, it has been abandoned since the 1930s.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Remnants of a storybook amusement park hidden behind a strip mall.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

This poor little statue is the most vandalized memorial in Washington.

A historic arena where the Beatles played their first concert in the U.S.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

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

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

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

The most decorated dog of World War I is preserved in the Smithsonian.