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.

The Rodopi Mountain Range National Park in Greece, also known as the Rhodopes National Park, is a vast and biodiverse area located in northern Greece along the border with Bulgaria. This protected area is part of the larger Rhodope Mountains, known for their rich ecosystems, cultural significance, and stunning landscapes.

Kastania Cave, also known as the Kastania Cave of Agios Andreas, is one of Greece's most impressive and lesser-known natural wonders. It is located near the village of Kastania in the southeastern Peloponnese, within the region of Laconia. This cave is celebrated for its rich geological formations and captivating underground scenery.

The Archaeological Site of Olympia, located in the Peloponnese region of Greece, is one of the most important ancient sanctuaries in the world. Known as the birthplace of the Olympic Games, it served as a major cultural and religious center in ancient Greece.

The archaeological site of Mycenae, located in the northeastern part of the Peloponnesian Peninsula in Greece, is one of the most significant historical sites from the Late Bronze Age. It flourished during the second millennium BCE and is often considered the center of the Mycenaean civilization, which greatly influenced Greek culture and mythology.

The Simonos Petras Monastery, also known as Simonopetra, is one of the most striking monasteries on Mount Athos, Greece. Built on a steep cliff about 330 meters above the Aegean Sea, this Eastern Orthodox monastery seems almost to float above the water, creating an unforgettable sight with its dramatic, cliffside architecture. Founded in the 13th century by Saint Simon the Myrrhbearer, the monastery is dedicated to the Nativity of Christ.

The Holy Monastery of Hilandar, located on the Athos Peninsula in Greece, is one of the twenty Eastern Orthodox monasteries on Mount Athos. It holds immense significance, particularly for the Serbian Orthodox Church, as it was founded by Saint Sava and his father, Saint Simeon, the medieval ruler of Serbia, in 1198. Known for its deep historical and spiritual roots, Hilandar Monastery has been a focal point of Serbian culture and Orthodoxy for over 800 years.

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 magnificent Blue Caves are in the north of the Greek Ionian island of Zakynthos. the blue caves are only accessible by the sea. The biggest cave is called Kianoun, and there are, in general terms, many boats available for rent in the town port for tourists to be able to get to the blue caves.