It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

These mysterious mazes carved on the rock may be up to 4,000 years old.

A unique waterfall that some believe attracts the fairfolk.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

An ornate tomb pays tribute to one of the most influential and cherished military leaders in Vietnam's history.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

An extravagant monument to an extravagantly unpopular Emperor.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

World's largest cave was only discovered in 1991, and now offers tours to the public.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

The spot where the two men ate together now stands enclosed in glass.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

A relic of Victorian grandeur hides beneath a busy South London road.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Rebuilt remains of a temple to Roman god Mithras.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An unusual round church in London with a Templar past.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.