In 2010, Naren Shaam visited 14 European countries and got frustrated with rail and coach companies not allowing multimodal bookings.
"There was no way of knowing what was the fastest or the cheapest way," says Shaam, 33.
So, in 2012, he launched GoEuro, a continent-wide service offering all modes of travel.
It now covers 32,000 rail and bus stations and 207 airports in 12 European countries.
The site, which counts ten million monthly users, has raised $76 million.