One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

This combination shop and museum is filled with curious items and artifacts.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A fantastic castle rumored to be the birthplace of King Arthur.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

The Bristol Camera Obscura housed in an ancient windmill.

The designer of this railway tunnel added a birthday present for himself.

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Where condemned pirates met their grisly end at the gallows on the River Thames.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

This skewed English house has looked like it's going to fall over for centuries.

One of England's most famous churches hides a pair of little known architectural treasures.

This unique building in the main square stands out among the city's typically Baroque architecture.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.