This quirky hot springs town known to locals as "T or C" was named after a radio show.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The country’s largest boat parade honors an infamous Spanish pirate—who never actually existed.

The curious underground history of keeping Paris clean.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Paris' linguistic guide to the international language of, yes, love.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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

The walls and streets of the ancient city are peppered with penises.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The fairy tale castle of the "fairy-tale king."

Come for the flowers, stay for the bats!

Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

Montreal's colorful subway station shows its support of the local LGBT+ community.

Every year, the colorful murals of Montreal get a complete makeover.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Home to works by notable Mexican artists and an underwater mosaic of the pre-Columbian goddess Gaia.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A macabre sculpture museum in the capital of Haiti fuses human bones with broken metal to create challenging contemporary art.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.