This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

A whimsical bridge adorned with decorative dragons.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

One of the best-preserved medieval streets in Europe.

These ruins once flourished as the capital of the Lydian kingdom, often credited with the invention of metal coinage.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

The ancient latrines of the Greeks, in all their public glory.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

The Aldie Gristmill was once the largest factory of its kind in Loudoun County.

The only U.S. Senator to die on the field of battle is buried in San Francisco but memorialized at Balls Bluff Regional Park.

Named for a Greek oracle that interpreted the words of Zeus, this beautifully-restored manor home was once home to the architect of the Marshall Plan.

Designated as an Underground Railroad research site.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Dedicated to a synagogue that was destroyed after having survived World War II.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.