This large, circular tomb is the final resting place of the first emperor of Rome.

The only Roman honorific column in Istanbul.

This airport also offers travelers the chance to view thousands of years of Turkish history.

A section of the long chain that blocked enemy ships from entering Constantinople.

A sacred lake with thousands of sacred carp and a biblical history.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

The ancient abodes are a testament to human ingenuity amid harsh climates.

Ancient serpentine sacrifice holder that has stood the test of time.

A Turkish monastery tucked into a cliff wall.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A marvel of Byzantine engineering under the streets of Istanbul.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

The tomb of the mythological founder of Padua is not hidden in some obscure crypt, but stands right in the middle of the city square.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

One of the tallest bell towers in Italy plays a particular melody at just two times each day.