A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This curious, round temple is the oldest still-standing marble building in Rome.

This is the oldest Roman-made bridge in the city still existing in its original state.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

A Nesting Doll of Churches.

From a T-rex to a teapot, a cast of artificial fossils illustrates New Mexico's history.

Hidden in the Chihuahuan Desert resides an amazing collection of petroglyphs.

Once a year, the ruins of an ancient village come alive with hundreds of glowing farolitos.

Step back in time at an outdoor living history museum where New Mexico's cultural traditions come alive.

Spectacular 300-foot cliffs in a lush mountain canyon.

A flat-topped butte that makes a constant backdrop for Western art.

This sundial indicates the time based on where you stand within it.

This 1950s-era nostalgic roadside New Mexico attraction consists of a quirky curio store and museum embedded into the face of a cave.

These strange carved boulders in a forested canyon resemble tiny stone villages.

The remains of Abó, Gran Quivera, and Qurai are monuments to the long, complicated history of the Indigenous people of the Southwest.

A ghost town revived by hippies and wanderers throws its own special brand of holiday parade.

A little slice of Florida face-in-a-hole kitsch, unexpectedly located in a small New Mexico town.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

This popular pitstop lives up to its name.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.