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

Taxidermy of the racing horse with a huge heart, who inspired hope in the Depression.

This 19th-century convent is now a flourishing 21st-century hub for art.

Every hour a secret compartment drops from this giant pocket watch, revealing a lovely surprise.

Tiny artwork tucked within glass letterboxes form this hidden gem of an art gallery.

A beautiful 1920s tower filled with local hidden gems.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

You'll find the little birds tucked within the rocks of this Australian beach.

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Singapore's last surviving traditional village is hidden among giant skyscrapers and modern infrastructure.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

An architectural oddity of six stories, accessed by graceful ramps.

The last of Amsterdam's original sea level markers remaining in place.

Architectural monsters are devouring this palace's every door and window.

This large, circular tomb is the final resting place of the first emperor of Rome.

A massive marble foot is tucked away in a small alley near the Pantheon.

A forgotten "city of water" underneath the famous Trevi district.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

Claude Monet was baptized in this lavishly ornate Paris church.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

This emotive sculpture was originally created for the 1878 World's Fair.