This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A Nesting Doll of Churches.

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

Pilgrimage site for star-crossed lovers.

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

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

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

Ancient serpentine sacrifice holder that has stood the test of time.

A charming beach town in Turkey captures all the colors of the rainbow.

A fountain standing as a testament to a doomed alliance.

Large miniature theme park with 100-plus models.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This famous city eluded concrete detection until the early 2000's.

Roman ruins top white travertine terraces formed by ancient hot springs.