What escort site has tourist attraction info on their home page?
And I didn't see anything mentioned about screening clients.

Weird.

Tineye found it posted in 2013 on internationalescorts website

I would guess it's not a legit website  

 
The images of "Thelma" also had results on tineye dating back to 2012
Those were the only two I looked up and the face they both are found elsewhere is suspect

Off the top of my head...  

"Carissa" is Crissy Moran, former pornstar who found Jesus years ago. I highly doubt she's providing.  

"Emma" is Carli Banks, pornstar.

"Hillary" is Dani Woodward. I think she provides using her own name.  

So, yeah, I wouldn't trust it.

Old school Vegas style.  Some of those smoking hot pornstars may still provide, but most assuredly not through that agency.  You could check Pamela Peaks or helpubookher (is it still around?).  The scam is you call for "Hillary" and are told she isn't available, but so and so is.  Some skank shows up to your door, asks for the donation which gets her in the door only.  Everything else is an uncharge.   Hold hands? $50.00, etc.  Perfect for rich drunk Albanians.