This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

100 massive sculptures in the Hudson River Valley.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

A castle built for love, and abandoned due to heartbreak.

A semi-scholarly approach to sex.

A CT scan revealed the identity of this 3,000-year-old mummy that everyone erroneously thought was female.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

The king of U.S. high points towers over every other peak on the continent.

A mysterious echo seems to defy the laws of acoustics.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Why have you never heard of the second most popular tourist site in New York?

Two mermen, eternally spitting into each other's mouths.