Natural sonic phenomenon comes with a grisly legend of murder and blood.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This fairytale-inspired cottage was created by a university literature professor.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

David Sedaris called it "The greatest shop in the world."

999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

An original apothecary from 1792.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A 12th-century fortress containing some of Berlin's oldest buildings.

Wonderland replication in progress by one persistent man.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

These "anatomical machines" are only one of the many strange items in this Italian crypt.

66,000 pieces of art, donated by one of the world's richest men.