Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Remnants of cone-shaped fascist bomb shelters in Milan.

A massive mausoleum towers over the gravestones in a 19th-century Italian "model village."

This half-finished "city of toys" was almost Italy's own Las Vegas.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

An architect's childhood fantasy treehouse made real.

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

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

A beautiful geyser under environmental threat.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

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

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Medicinal spa created with the discharge from a geothermal energy plant.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

France's most famous cemetery, with some of its most curious tombs.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

A magical place that lets you play in and explore the world of Studio Ghibli.

This magnificent white pagoda was constructed to resemble a sacred Buddhist mountain.

Gigantic unfinished stupa and the world's 2nd largest bell.

A grand example of 19th century Burmese teak architecture, and the most significant of Mandalay's historic buildings.

This golden temple is surrounded by hundreds of stone tablets that comprise the "world's largest book."