Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Rippling sand dunes frozen in the Arizona rock.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

The colonial city's social history is reflected in its fanciful door knockers.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

The Man In Black grew up in a large agrarian community established by the federal government in the Great Depression.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

The Ozarks' strangest dwelling.

A giant interactive periodic table with real samples of the elements.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.