Reforestation in action is the main attraction in this abandoned quarry.

Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

This shrine to the patron saint of Alaska sits on a small tidal island and was built from the land’s own beach stones.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

Former military fort and site of untold horrors during WWII, this island may become the Adriatic's next luxury resort.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A jaw-dropping brutalist space church seems to have crash-landed in the middle of America.

Each year, Germany's "City of Dragons" slays the world's largest walking robot.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The stunning remnants of this wreck emerge from an otherworldly backdrop of rainforests.

The remains of a former logging boom town, crumbled away in the forest.

A renegade art installation in a small Vancouver park is now officially sanctioned by the City Parks Department.