Barbican Conservatory, Barbican

Fulham Palace Gardens Karen Hunt / Alamy Stock Photo

The conservatory that sits on top of the Barbican theatre’s fly tower is the second biggest conservatory in London, spanning 23,000 square feet and providing a home to more than 2000 species of tropical plants and trees, as well as terrapins and koi carp. Opening times are limited to selected Sundays and Bank Holidays so make sure to check the website before visiting.