The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

Bohemian paradise covered in majestic forests.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

Catacombs turned marketplace.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

This little-used trail winds through the highest mountain range in central Nevada with sections around 10,000 feet.

Crooked windswept pines give this old forest an enchanted and magical look.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

This Seattle store is packed with all sorts of curious creatures and creations.

A walk through the historic city center, under the streets of Seattle.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

A tunnel of hardened lava along Maui’s famous Road to Hana.

A 140-year-old castle with underground caves hidden in San Francisco.

This artificial cave looks like something out of a fairytale.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

The hidden lair of an alchemist rediscovered in a 2002 flood.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

A forgotten "city of water" underneath the famous Trevi district.

Architectureal fantasy quarter of Rome.