The canons in the harbor, the imposing mansions, the historic monasteries are a sample of Hydra's glorious past. Significant families who starred in the Revolution of 1821 (Kountouriotis, Miaouli, Kriezi, Tobazis, etc.) came from Hydra. The island experienced exceptional economic growth in the past thanks to its great naval and commercial activity.

The town of Hydra is built amphitheatrically around the harbor, where small boats, tourist boats and cruise ships flood the pier, especially during the summer months. The stone mansions of Hydra stand as fortresses in the rocky landscape, highlighting the magnificence of the island.