The only road through the heart of Glacier National Park.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

This kitschy tavern is also home to rare early editions of "Treasure Island."

"X" marks the spot of an echo chamber in the middle of a plaza.

This freshwater spring fills with 10,000 gallons of water per minute.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

The quirky gift from West Berlin for the 1968 World's Fair still stands in Hemisfair Park.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

As its grandiose name implies, this wooden dome is unsurpassed in size.

A 12-foot sculpture serves as a constant reminder of the importance of protecting and restoring the Boardman River.   

This tree was warped centuries ago to serve as a botanical wayfaring tool.

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

Former self-sufficient mental institution now a planned community.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

This museum explores the grim reality of life in the earliest British colonies in America.