There is an Indian website for booking Indian Railway tickets with massive amount of traffic.
However, it's usability is very very poor.
You could probably redesign the website and add it in your portfolio.
Key points to remember about that site are:
1) URL - www.irctc.co.in
2) India is multilingual with Hindi being the national language and hence the highest number of speakers, followed by English and a zillion other regional languages.
3) The target audience of the website consists of grossly illiterate and uneducated users who hardly use any internet in their daily lives. They are not tech savvy at all.
4) The website books around 8,000 tickets/minute.
5) 40% of customers pay for IRCTC Ticket Booking through Internet banking & 30% user use Credit/Debit cards.
And of course you can google to find out more about IRCTC.
But this project would be very useful as it can add to your portfolio a lot of UX related things.