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

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Of all the unique artifacts inside this library, a mummified hand stands out among the others.

A mysterious echo seems to defy the laws of acoustics.

All that remains of the once-booming chain is a single orange-roofed restaurant.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Something's watching you.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

Fascinating town where normal life interfaces with the occult.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

The heads of two giant mythological water horses honor Scotland's horselord past.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

This Scottish burial tomb once held hundreds of ancient eagle bones.

Possibly the oldest of Britain's ancient henges is also one of its most stark.