This Orthodox Church's exterior is rather unorthodox.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This cave holds a surprisingly colorful variety of geological oddities.

This family driveway also serves as the highest point in Illinois.

South Korea's only sex-themed park.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

America's oldest archaeological site or a muddled case of wishful thinking.

An underwater road considered a possible Atlantis location.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.

Mysterious tombstones thought to be remnants of Atlantis.

Stalactites and stalagmites in a beautifully lit cave.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The oldest stone house in Paris was built by its most famous alchemist.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The largest earthwork effigy in the world.

The ancient tomb acts as a calendar that keeps perfect time.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

The mummified relics of an American missionary.

An underground city of salt.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Church holding the preserved body of a levitating saint.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Rome's semi-secret peephole vista is also a former Crusader stronghold.