Before this rocky hill was home to a chapel, it was used as a lookout by Romans and Moors.

Europe's largest collection of matchbox designs is a fascinating exploration of the cultural history of the world.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

Building owners can take out tiles for free at this repository for historic building materials.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

The best place in the world to buy tinned fish.

This abandoned five-star hotel is now a five-star urban exploration destination.

Perhaps the most spectacular grotto along the Algarve coastline.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

The world's oldest bookshop still in operation.

Houses are tucked between, on, and underneath giant boulders.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

North America's largest accredited model railroad museum.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

A couple turned their front yard into an artistic masterpiece.

An inconspicuous footbridge beloved by San Diego locals.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

A geometric jumble of homes.

The first (but not only) upside-down house in Germany.

Step into a cartoon at this Seoul café that aims to evoke a two-dimensional scene.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.