Erzsébet Tér also houses “The National Ditch” — a hole originally dug for the foundations of a new national theater. After the project stalled, the site was eventually repurposed as a parking garage, nightclub, and wading pond. On hot days, folks can soak their tootsies in the shallow pool while peering down through the water and into the glass-roofed Arkvarium, a funky café and nightclub that sits beneath the pond.