This artificial cave looks like something out of a fairytale.

Once the home of a hermetic monk, this cave now houses a small church.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

This macabre shop, filled with art, oddities, and taxidermy is hidden in the heart of the French Quarter.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

If New Orleans is the birthplace of the "cocktail," why does their own museum of cocktail memorabilia beg to differ?

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Thousands of well-dressed mummies below a monastery.

Architectural monsters are devouring this palace's every door and window.

The final resting place of the poets Shelley and Keats.