Here is a lovely little location. A ruined city, where rusting rebar pokes out of crumbling concrete. The skeletons of office towers and apartment high-rises slowly crumble, resisting even thousands of years of nature's slow urging to degrade and crumble. Foul water pools in places, and sickly vegetation crawls up the towers and through the tunnels and streets.

It's also full to the brim with lurking monsters, and in every corner the restless undead lurk. Not only mere zombies, but more exotic and terrifying varietals, fragments of evil with unpredictable and terrifying powers.

Why would someone explore such a place? 

There are rumors of immense treasure, of course. Intact technological artifacts from such places can set you up for life. Maybe even make you a king.

Anyway, welcome to a new visitor, dropping out of a Rift in space that opens suddenly to somewhere Else and declines to explain itself, closing again just a few moments after and depositing a passenger onto a slightly tilted concrete slab that used to be a spacecraft landing pad.

It's cloudy, and very warm, and smells faintly of rust and rot. There is jungle on three sides, and a huge ruined airport-style terminal with ruined city behind it on the other.

Oh, and there's a flock of evil-looking birds with glowing red eyes flapping this way.