Where manatees are the snowbird vacationers in these balmy Florida springs.

A mysterious castle built as a monument to lost love.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

A tribute to Ponce de Leon's supposed quest for eternal youth.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

The only Florida state park with publicly accessible caves.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

The largest freshwater lake in the Florida Keys.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The highest bridge in America was built for an almost unnervingly small amount of money.

When ecosystems collide in the arid Southwest.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Handcrafted thermal spa washes away each night with the tide.

Largest Kauri tree in New Zealand.

Watch the seas clash at the place where according to Maori tradition, the spirits depart for their journey to the afterlife.