A burial ground of rusting metal grave markers.

This sculpture forces visitors to confront their relationship with space.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

A massive sea stack famous for its appearance in The Goonies.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Cryptic messages embedded in the New York City sidewalk.

Visit the monolithic tomb of America's most famous general.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

An artist's cute bronze subway sculptures belie his violent artistic past.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Avoid gangster interaction while window-shopping.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Elevated freight railway turned wildly successful urban park.

This former coal gasification plant found a curious second life as a popular public park.

A giant Troll lurks under one of Seattle's oldest bridges.

This Buddhist monastery once housed an image of Buddha containing a 19-carat diamond.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The fragmented remains of a massive public bath connected to the city's water supply.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The final resting place of New Orleans' most famous voodoo priestess.