One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

Colorado's only true geyser is hidden within the San Juan National Forest.

A little-known hot spring haven right below the highway.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.