Dive into Budapest's underground world

As one of Europe's most famous cities, Budapest has become a tourist hotspot because of its history, architecture and especially its great love for... water. While most visitors will soak in the crowded hot springs, the real hidden gem of Budapest lies in the underground world below the city.

There are more than 80 hot springs in Hungary's capital. As these naturally occurring hot springs flow deep beneath the Earth's surface, they have created hundreds of caves, making Budapest home to the world's largest collection of geothermal caves. Although divers have explored more than four miles of tunnels since the 1950s, there's still a long way to go.

Take a look at part of Budapest's hidden gem:

Lan Oanh