Singing Towers
From Tardis Wiki, the free Doctor Who reference
The Singing Towers of Darillium was where the Eleventh Doctor spent what he knew would be his last night with River Song alive. (TV: Forest of the Dead)
The Doctor also met a past version of himself on this night, when River went into the wrong version of the TARDIS. The younger Doctor asked his future self if this was to be the last time River would see him (alive); the future Doctor replied, "Spoilers". (TV: Last Night)
