Sprawling across both sides of the Danube River, Budapest is one of the most iconic cities in Eastern Europe. There are endless things to see and do here, but if you only have a day, make sure to visit the relaxing mineral baths, stop by the landmark Hungarian Parliament Building, and take the funicular up to Buda’s Old Town to marvel at the castle and the jaw dropping city views. If you love it here so much that you end up deciding to spend the night, you can also take advantage of the city's incredible nightlife, which revolves largely around the eclectic "ruin bars". Map of Budapest