The futuristic structure was based on a traditional arched bridge.

The first-floor landing opens dramatically at the back on to an imposing stone arched bridge crossing the broad dry moat to a parterre garden now grassed over.

However, only those with a suitable fingerboard and arched bridge radius can be bowed.

A 1934 project constructed a second arched bridge immediately downstream and connected both bridges with a single deck.

The arched bridge in use today was constructed in the early 20th century.