Peek into the world of those creating the beautiful, delicate paper parasols found all over the globe.

One of the deepest blue holes in the world.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

Celebrated in poem, this tiny hidden cemetery has a big and grisly history.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

Belfast's namesake river still winds below the city center, hidden from sight.

The statue honors a beloved bird that once roamed St. George's Market.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

It was once nicknamed "the most bombed hotel in Europe."

Hundreds of hidden passageways weave through the old quarters of Lyon.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Countless grotesque faces stare out from this eerie Prague art wall.

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

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

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

Two stunning 17th-century libraries and a cabinet of curiosities.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

An enormous and lavish Gothic church in Czechia.

Two monstrous faces loom over a village in Czechia.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

This former quarry is now a picturesque gorge that hides a sunken lake.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

Walk through Czech history in Prague's largest graveyard.

This artificial cave looks like something out of a fairytale.