Translation of glossary in German

I hope you can understand the corrections this way... Two small errors. let me know if there is a word or sentence or phrase that you didn't understand! I will try to think more on the "since" question...
The different monuments were located in one big compound in the center. Strangely on the same day that we have visited there the prime minister of Thailand came for a visit in the same area.
The counter opened 45 minutes before take-off, and we really had to beg the ground personal to check for another seat. They were friendly, but nonetheless we felt that they would do us a favor.