Ancient human, animal, and geometric figures drawn in the earth.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

The ghostly remains of an accidental sea.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

These pretty kitties killed and ate as many as 135 railway workers.

This remote castle was built to be a wealthy businessman's palace of vice but is now simply a historic vacation cottage.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

Native Americans built this circle of stones, which was used to predict astronomical events.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

A simple Colonial home with a past haunted by death and madness.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

This landmark cemetery in Boston was created more than 300 years ago.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

Mosaics, storks, and brothels—this ancient city has it all.

Mysterious craters may have been home to an ancient cult.

An endless sea of white conical domes.

Rebuilt remains of a temple to Roman god Mithras.

A deadly ancient portal to the underworld.