Montpellier Rotunda

In 1809, Henry Thompson constructed a wooden pavilion with a colonnade as part of the wider development of the "Montpellier Spa" on land previously known as Trafalgar Field. By 1817 it had been rebuilt in stone as the Montpellier Spa became increasingly popular. Thompson employed the architect George Allen Underwood, who completed the building with a statue of a crouching lion on the parapet. In 1826, Henry Thompson's son Pearson Thompson asked John Buonarotti Papworth to oversee the project and it was during this period that the dome was erected. who undertook restoration work.

The building has limestone walls with a copper roof. The front of the building has a colonnade of doric columns, a frieze of alternating square and rectangular panels and a parapet. The central wooden dome in the assembly room is coffered internally and has light entering via the lantern in the centre. The room is 56 ft high and 54 ft across.