An auroral research program that superheats the ionosphere.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

The king of U.S. high points towers over every other peak on the continent.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

One of England's most famous churches hides a pair of little known architectural treasures.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

This Sri Lankan cemetery is the final resting place of sci-fi legend Sir Arthur C. Clarke.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

This renaissance château was home to an infamous witch hunter who sent a hundred suspected witches to their deaths.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.

The mystery of the Putim Ossuary involves a tricorn hat.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

One of Bristol's best-hidden gems has ties to Lord Byron, whence it became the nation's first reformatory school for girls.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

At Ghana's largest wildlife refuge you feel like you're right in the animals' backyard.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.