A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The first declared National Monument in the United States.

This haunting tombstone comes complete with a heartbreaking story of love and loss.

An eerie smiling woman looms above the granite tombstones.

A 19th-century cemetery device to ensure that the prematurely buried would be "saved by the bell."

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

One of the oldest living oak trees in the Southeast.

Twenty-eight years after this local landmark was washed ashore by hurricane Hugo, it was washed away by hurricane Irma.

This outdoor exhibit features a historic wooden dam once used to help boats navigate the Ohio River.

The first Russian Orthodox church in North America and an Alaskan landmark.

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

A fitting attraction for the corn capital of the world.

This massive roadside mascot was the first version of the giant to illustrate his butt.

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

The failure of one component toppled this entire bridge during rush hour.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

This university transit system is a 1970's vision of the future.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.