A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Something's watching you.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

The oldest still-operating tavern in the United States was once owned by a pirate.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Ozymandias’ time-keeping temple.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

One of the most well-preserved temples of ancient Egypt.

Ancient Egyptian relief, claimed to depict an electrical light.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

Slum Settlement Filled With Mountains of Garbage.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

In Egypt's expanding metro area, many of the neighbors are dead.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.