The external arch and adjoining side-walls are all that remains of the main gatehouse of St Mary's Abbey. The arch has been dated to the late 12th century.

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The gatehouse remains (now the Marygate entrance to Museum Gardens) from the northwest, with St Mary's Lodge to the right.

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The gatehouse remains from the southwest, with the neat garden of St Mary's Lodge in the foreground.

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The southwest sidewall. The stonework shows clear evidence of the original vaulted ceiling, which would have been similar to that still visible in the Water Gate of St Leonard's Priory.

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Another view of the southwest sidewall showing details of the carved stonework. The fluted column (right) originally framed (and supported the hinges of) one of the outer gates.