This mysterious, medieval cathedral remains unbuilt but fiercely protected.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A Romanian church built from one single oak.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.