ground except portions of the retaining walls; the so-called Tomb of Leonidas, a quadrangular building, perhaps a temple, constructed of immense blocks of stone and containing two chambers; the foundation of an ancient bridge over the Eurotas; the ruins of a circular structure; some remains of late Roman fortifications; several brick buildings and mosaic pavements. The remaining archaeological wealth consisted of inscriptions, sculptures, and other objects collected in the local museum, founded by Stamatakis in 1872 and enlarged in 1907. Partial excavation of the round building was undertaken in 1892 and 1893 by the American School at Athens. The structure has been since found to be a semicircular retaining wall of Hellenic origin that was partly restored during the Roman period. In 1904, the British School at Athens began a thorough exploration of Laconia, and in the following year excavations were made at Thalamae, Geronthrae, and Angelona near Monemvasia. In 1906, excavations began in Sparta itself. A "small circus" (as described by Leake) proved to be a theatre-like building constructed soon after 200 AD around the altar and in front of the Temple of Artemis Orthia. It is believed that musical and gymnastic contests took place here, as well as the famous flogging ordeal administered to Spartan boys (diamastigosis). The temple, which can be dated to the 2nd century BC, rests on the foundation of an older temple of the 6th century, and close beside it were found the remains of a yet earlier temple, dating from the 9th or even the 10th century. The votive offerings in clay, amber, bronze, ivory and lead dating from the 9th to the 4th centuries BC, which were found in great profusion within the precinct range, supply invaluable information about early Spartan art. In 1907, the location of the sanctuary of Athena "of the Brazen House" (Χαλκίοικος, Chalkioikos) was determined to be on the acropolis immediately above the theatre. Though the actual temple is almost completely destroyed, the site has produced the longest extant archaic inscription in Laconia, numerous bronze nails and plates, and a considerable number of votive offerings. The city-wall, built in successive stages from the 4th to the 2nd century, was traced for a great part of its circuit, which measured 48 stades or nearly (Polyb. 1X. 21). The late Roman wall enclosing the acropolis, part of which probably dates from the years following the Gothic raid of 262 AD,