The Connecticut village named for its subterranean thunder.

This picturesque Victorian ghost town was once a thriving mill community.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

A sculptural commentary on capitalism pokes up from the East River.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

Site of the first pathological and bacteriological research facility in the United States.

One of only two commuter aerial tramways in the United States.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

This abandoned subway station can still be seen on regular commuter trips.

Nope, not Washington Irving's house.

A posh members-only club with a literally dramatic history.

A small part of lower Manhattan is actually made from a bit of England.

Test your business savvy and play the market for cocktails at this stock exchange-inspired watering hole.

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

The former hotel where Tesla invented the radio.