If you’re a spelunker, put Aggtelek National Park on your bucket list for Hungary. Located in northern Hungary about a three-hour drive from Budapest, the park is home to the largest stalactic cave, in Europe. Guided tours, geared to physical capabilities, are available. A special cave experience is listening to concerts inside Baradla. The park is a protected area, with some parts off-limits to tourists, while visitors must remain on marked hiking trails in others. Aggtelek National Park is a good place to see flora and fauna, and visit quaint villages within its boundaries.