This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

The underground sanctuary of a mysterious ancient cult.

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

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

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

An alchemist's “magic door” stands in the middle of a Roman park.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

What looks like a normal building is really a hollow facade hiding a subway vent.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

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

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

This sculpture meant to honor the bravery of the Indigenous Mapuche people of Chile proved controversial.

This museum covers 10,000 years of Pre-Columbian Latin American history.

Pablo Neruda's custom-built lover's nest was made to remind him of the sea and named after his mistress' hair.

The gorgeous murals at this open-air museum form the largest street art collective in Chile.

A beautiful deserted greenhouse in the middle of a park.

A beautiful young girl said to have been buried alive in her coffin…

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

This skyscraper once housed weapons during the revolution and was the scene of two brutal crimes that shocked São Paulo society.

The ruins of a 19th-century aqueduct run through this Brazilian island's deep forest.

One of the last designs from architect Oscar Niemeyer.