Island wonderland for communist autocrats.

An apparition of Virgin Mary in Herzegovina.

Where the lovelorn find a home for their sentimental keepsakes.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

After Christopher Columbus died, his son built a fancy house to rule from.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

A completely underwater art museum sends a stark message about humans' impact on the environment.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

This island hill is strewn with boulders carved by shipwreck victims from the age of sail.

Uninhabited islet in the Caribbean is the sanctuary of giant lizards.

Artists and musicians now rule over this former rail station.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

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

A technicolor place of worship for Elevationists.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

A giant scrawl on the skyline of south London.

The medieval woodcut-style artwork chronicles life in medieval London.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.