This medieval manor house was equipped with secret compartments for hiding priests.

Known as the "Stairway to Heaven," this historic canal dates back to the 1700s.

The longest canal aqueduct in England was built without a plan to get water past the moving boats.

Budapest's Communist-era statues, banished to the suburbs.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The site of the first battle of World War II.

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

An underground city of salt.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This historic national park is covered in the stunning ruins of red rock pueblos.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

Watch the newest land on the planet form before your eyes.

The world’s largest LED display, built over an F1 race circuit.

Feed it cash, get your very own gold bar.

This enormous sports car themed amusement park is home to the world’s fastest roller coaster.

Home of the world's largest crocodile.