The site of a famous samurai duel.

A shrine of fire worship built on top of a natural flame.

The half-mile long structure is so impressive, it even shows up on satellite images.

This is the oldest Roman-made bridge in the city still existing in its original state.

Running since 1864, this clock has yet to be wound, one of the longest-running science experiments known.

These caves secretly held national treasures during World War II.

A flight of this "ghost staircase" has 40 steps on the way up, but only 39 steps on the way down.

A museum dedicated to a Cold War era sausage.

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

An indigenous ethnobotanist runs this brunch spot celebrating Australia’s native flavors.

One of the world's tallest flagpoles.

The house that took a plunge into the facade of a museum.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Existing for more than four centuries, the last of Hakone’s historic teahouses serves a sweet, mold-based rice drink.

Think you have a tough job? Try carrying 200 kilos through a cloud of sulfur down the side of a volcano.

6000-year-old coal fire moves one meter per year.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

These jagged limestone blades cut out through the canopy of the jungles of Borneo.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

This outdoor library provides around-the-clock access to around 7,000 books.

A historic steam train meanders along one of the most scenic rail routes in Germany's Black Forest.

An abandoned train station in Munich constructed for the 1972 Olympic games.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.