The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

One of the ghostly stops along Route 66.

Abandoned Air Force base that has fallen into disrepair.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Rebuilt remains of a temple to Roman god Mithras.

Banksy gives themself artistic license with this piece of London street art.

An unusual round church in London with a Templar past.

A hands-off space for graffiti artists to hone and display their skills.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A sweet symbol marks the place where torturous executions were once carried out.

This early version of the guillotine was used to execute the man responsible for its construction.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Small museum dedicated to the founder of electromagnetic theory.

The largest wax museum in the southern hemisphere features a grizzly chamber of horrors.

The legendary building that needed ghostly approval before being built.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

World's largest collection of serial killer artwork and other macabre exhibits.

A one-of-a-kind collection of a unique medium.

One man's ambition created this psychedelic log home.