A 142-foot-tall Q-tip on Bristol's skyline.

Inhospitable caverns just beneath this island paradise offer insights into alien worlds.

Two giant painted cooling towers make for one of the world’s most epic bungee jumps.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Final resting place of the humble physicist who discovered X-rays, and made the invisible visible.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

World's largest working waterwheel has been around for over 150 years.

Remains of military submarines built in secret jungle factories by the Tamil guerrillas' naval wing.

The victims of a free-floating Japanese bombing during WWII are remembered by this stone monument.

One of the deepest indoor swimming pools in the world.

This simple highway curve has become a comedic pilgrimage site.

This elegant arc of a waterfall marks a religious turning point.

This elaborate temple was built around one of the Buddha's teeth.

Longest canal tunnel in the world, abandoned in the 1960s.

The world's largest collection of artifacts from our history of industrial gas use is hard to simply pass.

Eyam took steps to quarantine themselves and keep the plague from spreading.

A preserved 18th century steel factory.