As the world's first memorial to commemorate gays and lesbians who've suffered persecution, the Homomonument is a must for any first-time gay visitor to Amsterdam. Conceived in 1970 and finally completed in 1987, it features three pink granite triangles laid out to create a larger triangle, in remembrance of the outcast symbol forced upon gays by the Nazis. The monument's set in a pretty location right on the Keizersgracht canal, just next to the historic Westerkerk.