Tallinn TV Tower

The TV tower in Kloostrimetsa is 314 m tall, with a viewing floor at 170 m that has glass panels underfoot. From April to October you can clip on a harness and walk round the outside at 175 m, and on a clear day you can see Helsinki.
When: Every day; the edge walk runs April to October, weather permitting.
Photo: Marmuras, Wikimedia Commons.