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

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Built in 1512, the oldest cathedral in the Americas.

Renowned restaurant tucked in a cave once occupied by buccaneers.

An old town theater converted into a celebration of the hobo legacy.

An unlikely Transcendental Meditation haven in the American Heartland built around the ancient Vedic principles of balance and harmony.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

Hollowed out cedar log tubs set in an ancient towering forest.

This frequently-photographed waterfall takes only a short hike to visit.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This extinct shield volcano is the lightning rod of the Cascades.

A chance to sleep among the firs and pines of the Oregon forest.

A botanic garden full of trees twisted into fantastic shapes and positions.

A public fountain that spouts "health water" from a nearby spring.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

A beautiful 62-acre Catholic shrine and botanical garden.

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

This pebble beach is so beautiful that taking its rocks is against the law.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.