The Tallinn TV Tower is a 314-metre concrete tower in the Pirita suburb, built for the 1980 Moscow Olympics and now open to visitors with an observation deck at 170 metres and a renovated interactive exhibition on Estonian science and technology. On a clear day you can see Helsinki, 80 kilometres across the Gulf of Finland.
The tower has an outdoor walkway at the observation level — a transparent floor section and outdoor ledge gives a proper sense of height. The exhibition covering Estonian digital innovation (e-governance, Skype, and the various startups that have emerged from here) is genuinely interesting and gives context to Estonia's reputation as one of the most digitally advanced countries in the world. Reached by bus from the centre.