Roman ruins, natural methane fires and a lovely beach.

Flames have been burning within this mountain for more than 2,500 years.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

A tiny chapel and burial site lurk underground in Jajce.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The tomb of one of the greatest travelers in history.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

This mysterious tower is said to enshrine a dormant seven-headed serpent that once protected Vientiane from destruction.

Perhaps the only one of its kind, the nearly-forgotten site once held mortal (and rigged) gladiatorial games between tigers and imperial war elephants.

A monastery considered a state-protected cultural monument of exceptional importance, founded in the 14th century by Serbian King Stefan Dečanski.

A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

An extraordinary collection of 18th century anatomical waxworks.

Secret refuge and museum of the Duke of Florence.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The oldest operating pharmacy in the world features 800-year-old recipes.