Tombs and amphitheatre at Xanthos, Turkey. The ruins of Xanthus are on the south slopes of a hill, the ancient acropolis, located on the northern outskirts of the modern city, on the left bank of the Xanthus, which flows beneath the hill. As the center of ancient Lycia and the site of its most extensive antiquities, Xanthos has been a mecca for students of Anatolian civilization since the early 19th century. Many important artefacts were found at the city. Two tombs, the Nereid Monument and the Tomb of Payava, are now exhibited in the British Museum. The Harpy Tomb is still located in the ruins of the city. The amphitheatre misaligned terraces may have be the result of an earthquake. The site has been designated as a UNESCO World Heritage Site since 1988.