A natural gas leak provides a flickering flame beneath a waterfall.

A remarkably opulent mansion with a tragic history.

This mansion was made famous by its colorful cast of owners and location along the Sante Fe Trail.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

The leathery remains of a woman who died in the 13th century now lie in a church named for her.

Legend said this huge, gnarled tree sheltered the saint during a storm.

Buried beneath an unassuming Gotland farm was the largest collection of Viking silver, mostly of Islamic origin.

One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

The quirky collection includes treasures like Elvis' underwear, Bob Barker's toothbrush, and hundreds of sock monkeys.

This elegant neoclassical garden is a peaceful oasis in the middle of the Nepalese capital.

This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

Lined with plaques and tributes to veterans, this patriotic street was founded by Mexican immigrants.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

The notorious Wild West outlaw was raised in this unassuming abode.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

A remarkable medieval structure born from a 14th-century disaster.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

A gem in the small Missouri town where Winston Churchill coined the term "Iron Curtain" and effectively began the Cold War.