This color-changing crater lake in El Salvador is occasionally impenetrable to sunlight.

The only boathouse Frank Lloyd Wright ever designed was also the only unbuilt structure in his famous Wasmuth Portfolio, until 2007.

Rocky outcrops containing overhangs, caves, fissures, clefts, and alcoves that invite exploration and scrambling.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This solemn facility remembers the cruel effort to compel Native American children to relinquish their culture.

The statues honor the state transportation employees who've died while performing their work-related duties.

For more than 50 years, an iconic sign has greeted visiting “fudgies” to the Traverse City area.

This tiny island bears the name of Civil War veteran, fisherman, and local celebrity Richard Bassett.

Get up close to an F-4 Phantom flown in the Vietnam War at this Florida park.

Sculptor Vadim Bora's bronze felines pay playful homage to architectural features no longer extant along Asheville's Wall Street.

This towering wooden Sasquatch was carved with a chainsaw.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A storybook church made from a mesmerizing medley of multi-colored stones.

An abandoned incline railway site is now a green space with six acres of trails connecting hilltop neighborhoods.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.

If you don't look closely, you might mistake this sculpture for just another passenger waiting at the airport.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The childhood home of a Hollywood legend.

True to its name, this little house presents like a dollhouse, and surprising details are revealed with a quick peek through the window.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.