Caves famous for the dragon-slaying saint who lived there.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

This massive redwood tree has a hole in the base big enough to drive through.

A dangling church built over a Colombian gorge.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This picturesque mansion has gone from opulent ruin to nature museum.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Obelisks and stone pineapples in the Irish countryside.

This geothermal hot spring hides beneath a slowly growing mineral dome.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

A humid oasis combines recreation with exploration in a unique underwater cavern.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Science fiction's grandfather has a fittingly marvelous tomb.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

Three bridges and one giant canyon make up this fantastic Spanish settlement.