
Pula Arena
One of the world's best-preserved Roman amphitheatres.
Photo: Olgierd Rudak / CC BY-SA 4.0

Photo: Orlovic / Wikimedia Commons
At the Verudela canyon, pale limestone walls squeeze together until only a strip of turquoise water is left between them. The brave launch themselves from ledges at different heights while everyone else watches from the warm rocks. Even without jumping, drifting through the clear water with a mask is worth it.
Check the depth and your exit before jumping; when the sea is rough, just watch.
A small next-step selection from the same city.

One of the world's best-preserved Roman amphitheatres.
Photo: Olgierd Rudak / CC BY-SA 4.0

Tito's island paradise of dinosaurs and safari.
Photo: Wikimedia Commons / CC BY-SA 4.0

A cool maze of WWI tunnels beneath the city hill.
Photo: Psittacuso / CC BY-SA 4.0
Use the free map from home, then verify the discovery when you reach the place.