Ancient

A mile-long navigable cave adorned with stalactites and stalagmites reaching up to 65 feet tall.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

A mysterious set of tunnels carved in the hills of rural northern Kyushu.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

Witness traditional silk production in the Uzbek city that's been a hub of sericulture for over a thousand years.

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

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

This mysteriously shaped boulder may have been used for human sacrifice in ancient times.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.