The Art Deco artwork depicts gilded carriers of deadly illnesses.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

You can climb to the top of the column built to honor the "father of British inland navigation."

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This 18th-century folly is one of Europe's rare "garden mosques."

A scale rocket of an Ariane 5 rocket serves as a monument to a pioneer of space science.

Money made from smuggling sugar helped create this wondrous rock maze in honor of the Prussian Queen Louise.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

Two monstrous faces loom over a village in Czechia.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Naturally formed rock city in Poland.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

One of the largest amphitheaters in Europe is a former Nazi German gathering place that still stands today.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

People in Poland have rallied to save this unnatural desert from being reclaimed by the forest.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A perfectly preserved hill village where the buildings are painted like white lace.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

Budapest's Communist-era statues, banished to the suburbs.

World's tallest cigar-shaped radio tower.

This castle was designed to have as many windows as there are days in the year.