This replica of the Greek structure is in the heart of Nashville.

The world's longest known cave system.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

This statue honors the author's groundbreaking family story.

Oldest building in California still in use.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

The world's tallest statue of an American hero.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

Beer lover's can-covered house.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

The land is home to swimming ponies and a legendary 18th-century treasure.

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

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

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

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The blinking light atop the iconic landmark has been sending secret messages for decades.