A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

A rather vulgar example of the transition from Latin to the Italian vernacular.

This statue is the only female representation of Rome's "talking statues."

A Nesting Doll of Churches.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

An alchemist's "magic door" stands in the middle of a Roman park.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

Where the rules of that most quintessentially English game were first devised by an eccentric inventor.

The longest hedge maze in the world.

A mysterious bridge over a sunken Roman road.

A museum dedicated to Wales’ favorite—and strangest-looking—watercraft.

This former military airfield's claim to fame came from a lucky accident during the Second World War.

A reportedly haunted 14th century church is curiously facing the “wrong direction.”

A historic house devoted to the teachings of a 1700's prophetess and her mysterious box of revelations.

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.