One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Eighty million natural history specimens call this gargantuan museum home.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

An early 20th-century bullring converted into a modern shopping center.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

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.

The most famous location in China was home to whole dynasties worth of imperial rulers.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A striking public sculpture representing the period of martial law in Communist Poland.

Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

This imposing 20th-century castle was abandoned before it was ever completed.

Museum dedicated to "the man who moved the Earth."

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

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

An underground city of salt.

Stairs often replace streets on the steep slopes of this old mining town.