The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

Quite simply the largest tree in the world (by volume).

Haunting and beautiful trees, doomed to die.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A gigantic 10-foot tall stone man.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

This single room has survived the centuries with almost no deterioration.

A glacier pocked with ice caves and surrounded by rainforests.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.