This giant Cold War satellite dish has become a symbol of Trinidad's need for sovereignty.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

"Iron Age" creatures fill this huckster's rusted metal sculpture garden.

This massive subterranean fissure is known as the "underground Grand Canyon."

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

Ghost Town in the Demilitarized Zone of the Golan Heights.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

A man-made island fort that has housed soldiers, scientists, and ravers.

An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

A genuine Little Shop of Horrors.

One of the most accessible undersea plane wrecks in the world.

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

A former ironworks that was the first UNESCO industrial site.

Housed in an old church, this hunting museum holds a collection of mythical bird-rabbit creatures.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

An abandoned stretch of elevated road in the middle of the Brazilian jungle.