This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A beautiful but toxic fountain of mercury.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

A plaque in Madrid’s West Park marks the launch of a queer icon’s unlikely media career.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

A celebrated bandstand at the center of what was once the worst slum in London.

The bronze uniforms commemorate the vital role of women during World War II.

Where's a guy to go after a long, hard day at work?

A small museum that celebrates the history and culture of the LGBTQ community in England.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.