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

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Norway's oldest cathedral still in use.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

A historic freight system that found the true gold rush is in tourism.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

An eclectic blend of esoteric imagery covers its interior.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This series of waterfalls tumble into a radiantly blue river.

The enigmatic and seldom visited ruins of a Mayan city-state.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

This wildlife trust is dedicated to orphaned elephant rescue and conservation.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

Natural arch offers panoramic views of Yangshuo's karst hills.

The beautiful 16th-century stepwell lies in the shadow of a famous fortress.