Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

A grove of "candelabra redwoods" deep in California's Lost Coast.

This castle played host to the largest great hall found in medieval Central Europe.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

Each winter this underground cave forms a dazzling ice palace.

A hidden three-foot-wide house separates these two regal churches.

Home to the ancient Roman temple of a lesser-known Celtic god that inspired J. R. R. Tolkien and H. P. Lovecraft.

One of the most well-preserved mammoth specimens in the world.

This lonely gas station has stood at this location since 1917.

This stone obelisk commemorates the discovery of the world's largest gold nugget.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This museum located in Fondi is also said to be the most haunted building in town.

Norway has built what may be the world's most beautiful public toilet.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

On the Oregon coast there is a natural hole that seems to be draining the sea.

An abandoned theme park with a strange and tumultuous past.

A devilishly named gorge that was a sign of salvation for many pioneers.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

These small, triangular, colorful houses are a staple of Madeira Island.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

After Havre burned down, the best place to build was under the ashes.

A once celebrated industrial wonder now lurks in a quiet corner of Flathead Lake.

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