Walk through Czech history in Prague's largest graveyard.

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

A stately palace has been converted into the world's largest cannabis museum.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

The Liverpool street made famous by the Beatles is real.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Apartment complexes built into huge repurposed natural gas tanks.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Op-art architecture designed for happiness.

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

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The only museum with its curator—and her pets—buried inside.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Every inch of this chapel is covered in craftsmanship from across the world.

Cave shrine on Monte Pellegrino.

Thousands of well-dressed mummies below a monastery.

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