A spectrum of colors awaits visitors to one of Mexico's most gorgeous bodies of water.

A former travertine mine traces the geological history of this unique desert filled with crystalline blue pools.

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

It's believed human settlements from the Palaeolithic Age were established not far from this canyon.

A 40-foot waterfall flows into this unique natural swimming hole.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

One of the only places where Earth’s mantle lies above water.

This granite rock face is named for the magnificent reflection that occurs when the sun hits it just right.

A cozy bookstore is tucked within an old gold mine shaft beneath the cafe and ice cream shop.

Where the writer penned his famous story about a jumping frog.

Hidden beneath a lake for decades, this brutalist mine has now emerged from beneath the receding waters.

An expansive and intricately restored mansion remains from over a century ago--and so do its ghosts.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

If you like Art Deco you will love this bridge.

This elaborate stone bridge over the Neisse river has sat in pieces since 1945.

Though it's no longer a functioning train depot, this castle-like structure is an important piece of Oklahoma history.

One of the largest early 20th-century bridges in Sudan.

Since Tokyo's Kiyosu Bridge was inspired by a historic bridge that crossed over the Rhine, this viewing spot is known as a "view of Cologne."

The longest covered bridge west of the Mississippi River.

A group of committed locals restored this centuries-old windmill to its original condition.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

This hidden gem in Arizona is truly worth the rugged journey.