Every equinox this Maya pyramid puts on a spooky ancient light show.

Three columns of volcanic rock shoot out of the ocean.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A monster in the plant world, up to 10 feet tall and smelling of death.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

Australian Lake set aglow by Noctiluca Scintillans.

A fiery crater has been burning in the Karakum Desert since 1971.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Bell tower juts out from a village buried under a lake.

An eerie, derelict amusement park in Berlin.

A restaurant and observation deck built in a unique broadcasting antenna.

Living trees form the structure of an open-air palace.

Standing stones found on a construction site are re-erected.

Now nearly dry, this lake is said to be the ancient home of the Lady of the Lake, and was once thought to be bottomless.

6000-year-old site covered in more than 50 megaliths.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

The inscribed stone at Kilnasaggart is a remnant from nearly a millennium ago.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.