Big Ben is the nickname of the clock tower at the north end of the Palace of Westminster in London, named after the great bell within the clock

I will stay 4 nights in Paris and 4 nights in London. I'll take a train from Paris to London. It will cost me $71 one way. I'm planning to visit Big Ben, and the Eiffel Tower while I'm there.

While I'm there:

The tour to see Big Ben is $45 per person.