Drift through underground caves on a tube.

Archaeological sites and great food inside the island's largest mangrove forest.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

This small fort played a huge role defending Puerto Rico’s capital city.

The short hike is worth the stunning views and crystal blue waters of a secluded beach.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This tiny home was originally a narrow alleyway.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

Behold the rickety glory of one of the oldest roller coasters still standing.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A tiny twin to Seattle's Fremont troll hides from the Florida sun under the Atlantic Boulevard drawbridge.

Once one of the largest producers of pig iron in the world.

A man's home is his castle.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Georgia's highest point was given its strange name thanks to a simple translation error.

There has been an astronomical clock on this spot since the 14th century.

According to legend a man pooped out the window of this tower to prove that it was straight.

In this truly magical place, rent hasn't been raised since the year 1520.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Tiny castle in the middle of the Rhine made you pay to pass.

Legendary site where an evil bishop was devoured by rodents.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.