This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The topiary maze at the Habsburg hunting lodge.

Discovered on a shipwreck after more than 400 years, this Renaissance ratter tells a very waggly tale.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

"X" marks the spot of an echo chamber in the middle of a plaza.

This haunting tombstone comes complete with a heartbreaking story of love and loss.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

A walkable map of the world, made from soil and stone by one man.

An Old West film set seen in countless TV shows and movies is open for the public to explore.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

This Pringle-shaped ledge makes for the perfect photo op.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Cat art as far as the eye can see.

This simple highway curve has become a comedic pilgrimage site.