Fabulous formations, weird and wonderful wildlife.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

One of just five sand-floor Jewish synagogues in the world.

A desert island with both a buried treasure and a famous castaway.

The world's second largest single-dish radio telescope, once used to contact E.T.

This "sausage route" features gorgeous views and family-owned restaurants.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This tiny home was originally a narrow alleyway.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A park where people have been going to feed friendly pigeons since the 18th century

One of few vertical lava tubes in the world accessible by foot.

The graffitied ruins stand hidden within the Pennsylvania woods.

It would take 35 firetrucks to fill this enormous glacial pothole.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

Above an abandoned Underground station, this charming bookstore is home to strange antiquities and literary works.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

Preserved behind glass, the ruins of a medieval building used to store human remains.

A historic house left in "dramatic still life."

This pub boasts a curious history and may have inspired a Dickens character.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.