This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

A roadway designed for a visiting monarch.

English parliaments were once convened by this ancient oak tree in the heart of Sherwood Forest.

What do we know about the real woman behind one of the Beatles' most famous songs?

Home to the world's oldest wooden building.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

The world's oldest railway bridge in continuous use.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

This church is known as "The Home Church of George Washington and George Mason."

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This isolated island is often capped by its own fluffy cloud.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

A marvel of Byzantine engineering under the streets of Istanbul.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

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

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

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Something's watching you.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.