A popular tourist cave with a dark past.

The huge granite obelisk that towers over a small California town.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

Where the writer penned his famous story about a jumping frog.

A ruined hotel with an unlucky history and an eerie present.

Hidden beneath a lake for decades, this brutalist mine has now emerged from beneath the receding waters.

An expansive and intricately restored mansion remains from over a century ago--and so do its ghosts.