Medieval portals, painted baroque door leaves, Art Nouveau entrances and bright wooden panel doors across Old Town, Kalamaja and Kadriorg.

A door-hunter's tour of Tallinn. The route starts on Town Hall Square with medieval portals and painted baroque door leaves, follows Pikk street's Renaissance and Art Nouveau entrances - including the 1640 door of the House of the Blackheads, Tallinn's most photographed door - then crosses into Kalamaja, where late-19th and early-20th-century wooden houses keep their bright panel doors, and finishes among the wooden villas of Kadriorg.
More fascinating resources about Tallinn's beautiful doors
doorsoftallinn.com. A website that collects photos of many more of Tallinn's doors. And you can order a beautiful picture frame with any of them from their web-shop.
https://parlpood.ee/toode/tallinn-doors-markmik. A book about Tallinn's doors.
https://www.behance.net/gallery/33106953/TALLINN-DOORS-chocolate-concept-packaging. Tallinn's doors chocolates. As of today, they are not sold anymore, as I understand.