On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

Swim or sail to this pie-slinging boat off the coast of St. Thomas.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

This tiny home was originally a narrow alleyway.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A park where people have been going to feed friendly pigeons since the 18th century

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

This colorful gate stands as an entrance to the walled city of Old San Juan.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This is one really big nut.

A volcanic core jutting above the plain between the Snake and Boise Rivers, a marker identifies the reference point for all U.S. Government Surveys in Idaho.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This erect, phallic geological spire wasn't always named so domestically.

One of the largest private collections of fossils in the world.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The oldest extant wooden jail in South Dakota and possibly the United States. 

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

One of the smallest towns in the United States.

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Inside this shop, visitors are treated to a unique blend of natural history and art.

In addition to over 80 vehicles on display covering over 100 years of motorcycle history, this free museum focuses on the people who ride and love these bikes.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.