World's first "penitentiary," meant to be humane, drove men insane.

The most famous location in China was home to whole dynasties worth of imperial rulers.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

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

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.