The centuries lie heavy upon these ancient caverns

We carry on past the bridge. We come up to a crows foot junction. The left passage goes up, the middle passage is level and the right passage goes down. Rob spots a possible trap. We go along the middle passage. After a while the sides and ceiling grow apart turning the passage into a large cavern. We follow the left wall. We get to the other side where there are two towers guarding a gate. The gate has stone doors which are ajar. We go through the doors and manage to get into the stone towers but there is nothing of any value. We carry on, but start a hear a strange droning noise that rises and falls in a slow rhythm.
We get to a cavern. There is a ledge that follows the cavern wall on the left wall of the cavern. There is a very deep drop to the right of the ledge. The droning is much louder here.  Following the ledge round the wall of the cavern we get to the opposite side and enter another passageway. We enter the passageway. After a moderate distance we come out of the passageway into a vast circular, almost arena like space open to the skies and surrounded by mountains. There are three exits. One straight ahead, one to the left and one to the right.
We go for the exit straight ahead and we start hearing water ahead. We enter a huge circular room with a river running from right to left in the centre blocking our path. Fortunately there is a bridge which crosses it but Rob detects a trap on the start of the bridge so we decide not to risk it and go back to the “arena”.
We decide to take the right exit. This leads to a labyrinth of passages that send us in circles and lead us nowhere of any interest. To avoid the danger of getting lost we go back to the “arena”.
We then try the left exit. After going down a corridor we get to a large circular hole which is very deep. At the bottom we can see the faint reddish glow of lava. Around this hole there is a descending spiral path. We rest for the night near the entrance to the hole.
The next morning we go back to the “arena” and decide to try our luck with the exit which was straight ahead. Rob decides to take his luck in his hands and attempts a mighty leap over the suspected trap. Disaster! On landing he stumbles, steps back and steps on the suspect trap. Nothing happens! Rob is so bad at detecting traps he had detected one where one didn’t exist. We cross the bridge and find two more towers guarding a gate at the other side of the cavern. The gate has dull black doors made of metal. Fortunately the doors are ajar. We go through the doors and carry on.
After a short while we enter a large rectangular room with a chasm crossing the centre from left to right. The chasm is filled with lava. There is a bridge which crosses the chasm. However there is a huge jet of lava that shoots up from the chasm to the left of the bridge and crosses it in an arch before falling back into the chasm on the other side. This is no doubt some nefarious magic. Unfortunately this magical lava arch over the bridge makes it look very dangerous to cross. Approaching the bridge the heat becomes dangerously high.
Rob has an idea. We all go back to the cavern with the river and Rob wets all his clothes in the river and we go back to the chasm. Holding his wet cloak over his head Rob dashes headlong onto the bridge towards the lava arch braving the enormous heat. Just as he gets under the arch the heat disappears and the temperature goes back to the normal. Rob shouts back to the others that there is a magical area under the lava arch where the temperature is normal so that they can rush across without danger. After getting over the rush to the arch, Rob rushes over the rest of the bridge and gets safely across. The others do the same.
We exit the room into another passage. After a while we exit the passage into the bottom of a crevice which is open to the skies. It has steep rocky sides. We follow this crevice as it bears to the right. We get to a fork with the crevice going up to the right and down to the left. We go right but our path is shortly blocked by a large gate house which is closed. We are unable to proceed as Rob fails to climb the wall.
We therefore retrace our steps back to the fork and go left. Shortly the left side falls away opening a huge vista over a very large valley. Over this valley we can see a very long and thin bridge which goes from up above us to the right all the way across this large valley to a plateau on the other side. We ponder long on this mighty feat of engineering!