Ancient rock fortress with frescoes.
Maya temples rising above the jungle.
Saudi Arabia's Nabataean rock tombs.
The Parthenon and its temples on the rock above Athens — the birthplace of democracy, best climbed at opening time.
Maya ruins on a cliff above a turquoise Caribbean beach — the only ancient city built right on the sea.
White travertine terraces and pools.
Xi'an's buried army of clay warriors.
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