This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A geological mystery on Camelback Mountain.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Legends surround this jagged rock formation in the New Mexico desert.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Once America's tallest structure, now a Baltimore landmark.

A statue honoring 44 continuous years of greeting passing ships.

An eerie smiling woman looms above the granite tombstones.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

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

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

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

When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

The highest bridge in America was built for an almost unnervingly small amount of money.