Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

Every inch of this chapel is covered in craftsmanship from across the world.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

142 ceramic steps become a mosaic once a year.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

This winding road through an Italian canyon may be the most scenic drive in the world.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

This Italian foot path winds through the mountains via 52 individual tunnels.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Crushed coral and crystals give the sand its signature coloration.

A Milanese café entirely designed by the American director Wes Anderson.

Go inside to really appreciate this 500-year-old technological masterpiece.

An Italian hillside ghost town.

Five candy-colored villages on the Italian Riviera.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

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

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

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

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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

One of the last realized projects of an influential, self-taught, French Modernist architect Jacques Couëlle.