This enormous World War II relic is one of the largest wooden structures in the world.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

A unique botanical garden housed in three giant geodesic domes.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

These unusual rooms on wheels are holdovers from the 1960s.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

This ruined 15th-century hermitage is steeped in myth and mystery.

This former industrial site has transformed into a community sculpture garden that hosts monthly Full Moon parties.

Cornish legend says these ancient circles were people turned to stone for playing hurling on a Sunday.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The Neolithic megalith was one of the first archaeological ruins protected by the British government.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The longest and widest floating bridge in the world.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

The highest peak in the state of Vermont has some interesting features.

A volcanic landmark located on an Ice age lake bed.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

Curious rock formations in a tiny Kansas state park.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Curious cave that stays a cool 56 degrees all year long.

A massive volcanic plug is now a protected area that hosts a number of bird species.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

This state park was once an important Native American cermonial center.