The cave of Melissani is located near Karavomilos on the island of Kefalonia. It is a lacustrine cave of unique beauty and fully developed cave, which is 3.5 km long, 40m wide and 36m high. Melissani cave constitutes a unique geological phenomenon. It was created by a mechanical and chemical process called karstikopoiisi (dissolution of rocks) during which water enters the calcareous rocks, erodes them and creates hollows.

The Aggitis River Cave, also known as the Maara Cave, is a stunning natural attraction located near the village of Aggitis in the Drama region of northern Greece. It is one of the longest river caves in the world and a significant geological and tourist site. The cave is approximately 21 kilometers long, though only a portion of it (about 500 meters) is accessible to visitors.

Meteora is a unique and breathtaking rock formation located in central Greece. It is famous for its monasteries perched atop towering rock pillars, creating a stunning and otherworldly landscape. Meteora is located in the Thessaly region of central Greece, near the town of Kalambaka. It's situated in a valley surrounded by towering rock formations.

The Corinth Canal is a man-made waterway located in Greece, which connects the Gulf of Corinth in the Ionian Sea with the Aegean Sea. It cuts through the narrow isthmus of Corinth and separates the Peloponnese peninsula from the mainland of Greece.

Santorini is an island in the southern Aegean Sea, about 200 km (120 mi) southeast from the Greek mainland. It is the largest island of a small, circular archipelago. It has an area of approximately 73 km2 (28 sq mi) and a 2011 census population of 15,550.

Greece is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. The country consists of nine traditional geographic regions, and has a population of approximately 10.7 million. Athens is the nation's capital and largest city, followed by Thessaloniki.