Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Amid the marketing blitz of modern Times Square is an elegant holdover from its showbiz glory days.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

The home of the first American-born saint is one of the only curved buildings in New York.

A crumbling hospital from the 1850s on Roosevelt Island.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

The world's largest bamboo labyrinth is a living demonstration of the plant’s immense potential.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

Charlie Smith was almost certainly not 137 years old when he died, but why let that get in the way of a great story?

This nature center has one of the largest collections of native raptors in the Pacific Northwest.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.