At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A sharp bend in a dramatic river canyon cut through red rocks.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

Gladiators once walked this ancient, subterranean passage.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Legend says this sacred tree was a gift from goddess Athena.

An ancient Greek monument and a Byzantine church coexist inside this cave.

The ruined doorway is a portal to the building's turbulent and torturous past.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.