A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A beautiful bamboo trail tucked in this famous Japanese shrine.

The largest greenhouse in the world is home to over one million types of plants.

A 300-ship graveyard, with a few still visible at low tide.

The remains of Crystal Palace Great Exhibition of 1851.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A cluttered and astounding collection of antiquities and curiosities.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Ride the subways of yesteryear.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

1,001 carved statues of the Buddhist God of Mercy, each with a unique face.

A museum dedicated to exhibiting remarkable outsider art.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

The celebrated eyesore created by starry-eyed sweethearts.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Strange red rock formations that have been attributed to a higher power for hundreds of years.