These constructed wetlands naturally filter millions of gallons of treated wastewater every day.

Follow the path behind this treat-slinging camper van to a sculpture garden in the forest.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

In the mountains of West Virginia is this perfectly preserved Art Deco train station.

Constructed in 1882, this jail once housed local inmates and the sheriff's family all under one roof.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

A beautiful hidden gem in central West Virginia.

An early-19th-century hotel with a past that is steeped in the Civil War.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

This building contains handprints that are well over a century old.

This centuries-old graveyard is the final resting place of the Fort Fisher Hermit.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

A unique cartoon-filled roadside attraction.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

This big empty pig is a nostalgic throwback to mid-20th-century Texas barbecue.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

This unique tower has been home to malaria-fighting bats for 100 years.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Giant heads occasionally litter the industrial Houston neighborhood where sculptor David Adickes has his studio.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

On a dusty county road sit the ruins of a ghost town's abandoned church.

Three hundred years of preserved Spanish colonial history in San Antonio.

A 131-year-old wunderkammer of Texas history.