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

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

A statue representing a lost Roman profession that was vandalized for centuries.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

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

2300-year-old Roman road connecting the empire.

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

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

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

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

This abandoned Brutalist treehouse is a hidden architectural relic.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

Flashy signs from Las Vegas’s past find their final resting place at this unusual graveyard.

The best Tiki bar in Las Vegas.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.