Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

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

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

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

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

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.

A sanctuary for sickly, stray, or wounded donkeys.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This replica of the Greek structure is in the heart of Nashville.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The secret city built by the Manhattan Project.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

Soaring over the Niagara Whirlpool since 1916.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

The highway's southernmost spot is a beloved local attraction.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The site of Paul Revere's historic two lantern warning.

Millions of numbers carved in glass represent the tattoos forced upon victims.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.