Medicinal spa created with the discharge from a geothermal energy plant.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This amazingly preserved Gold Rush town is a historian's dream.

A giant milk bottle from the 1930s beckons drivers to this diner.

A massive sea stack famous for its appearance in The Goonies.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An obscure waterfall that looks like something out of a fantasy novel.

The world's oldest bookshop still in operation.

This public elevator links the lower city to the upper city of Salvador.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

An encyclopedic collection of mammal penises.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Berlin's old airport.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

The site of the first battle of World War II.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.