The first thing that happens, as Andrej pulls on the door, the iron balls and the crowbars in the room vanish. There's no evidence they were ever there.
The second thing, as the door opens it lets in a blast of hot air - nothing to worry about, but the temperature outside the door is about 30 degrees hotter. Where before it was about 8 p.m. in the evening, the temperature cool, it is bright day outside and the temperature is balmy (around 80 degrees).
You're looking at a very desolate landscape.
What you can see are dunes with thing, scrub-growth on them, arresting them in place (unlike barchans, which move). The dunes are greyish-green in color, very pale, but flat and non-reflective in the bright sunlight. You can see nothing but this desert for as far as the eye can see, which is about a mile and a half before the last dune blocks your line-of-sight.
The sky is hazy blue. The air is very dry, and a rather gritty wind blows across the opening of the door. The scrub, which is composed of twisted, wooden branches, does not rise more than a few feet above the ground, and is scattered widely between the caked, hard soil. In the lowest places, between the dunes, clay has hardened into a rock-like pan.
There is no sign of water.
It does not look in the least familiar to you - even the Turk has not seen a desert similar to this. Certainly the lack of any sort of grass is unlike any place seen by the Half-orc. Naturally, the Ranger and the Mage are unfamiliar in the extreme.
And yet the Ranger senses more life than the other members of the party; he would profess to possibly a few giant insects; the visible spoor and prints of some hoofed animal, one he has not seen before. Water, if there is any, is certain to be downwind, to the left of the door, but just as certainly some miles away.
The knowledge is not encouraging.