Budapest is the capital and largest city of Hungary. It is located on the Danube River in the northern part of the country. Budapest is famous for its beautiful historic buildings, monumental building of the parliament, the royal castle and numerous monuments of religious architecture. It must be remembered that equally interesting things are hidden underneath the surface of the city. Budapest has the oldest subway in mainland Europe. It was opened in 1896 as the second in the world. However, Londoners could use the underground railway earlier than the inhabitants of the capital of Hungary. Moreover, underneath Budapest there is the system of underground caves with thermal springs and the lake that is 86 meters long.
