Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

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

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

A tiny chapel clings to a precipice above Germany’s gemstone capital.

Just another ancient, mysterious Irish stone circle.

The geoglyph once sported a glass bottle eye.

A preserved college lock-up that recalls a clubhouse approach to discipline.

It's good luck to be mocked by this monkey.

Largest lake in Great Britain measured by surface area.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

A scattered trail of street art adds a pop of color to the city's stark structures.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

Curtiss is a forgotten figure in the early history of flight.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This odd California folly seems like it was almost designed to accumulate urban legends.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

One street divides a single town that stands in two U.S. states.

The curious underground history of keeping Paris clean.