One of the most unusual visits in Paris, and one of the hardest to get into: entry is limited and timed, and slots regularly sell out. Guided tours often include areas closed to regular visitors.
Good to know
- Book as early as you can: same-day tickets are rare.
- It is cool underground all year round, so bring a layer even in summer.
- There are many steps down and up and no lift, so it is not suitable for visitors with reduced mobility.