This private residence was the template for one of the most beloved television homes of all time.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This glamorous old building is said to have inspired the Tower of Terror.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

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

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.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

These spartan apartments are provided to clergymen visiting Vatican City.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This quaint museum in a long-running workshop is dedicated to a fixture in New Orleans lighting.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

The world-record holder for the longest bridge stretching continuously over water.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.