Atlas Obscura readers shared their favorite lesser-known ancient sites, providing a list of remarkable ruins and archaeological wonders that offer unique glimpses into past civilizations. These locations range from the sunken terraces of Moray in Peru to the imposing Göbekli Tepe in Turkey, each offering an intimate connection to history often without the crowds found at more famous sites.
  

Key Points: 

1. Göbekli Tepe in Turkey, dating back to 10,000 B.C., stands out for its monumental carved stone structures, predating Stonehenge and the pyramids.
2. Moray in Peru fascinates visitors with its deep agricultural terraces, suggesting advanced ancient farming techniques and less crowded than the famous Machu Picchu.
3. La Ciudad Perdida in Colombia, older than Machu Picchu, presents a challenging but rewarding trek through the jungle, leading to the ruins of an ancient city.
4. Acrocorinth in Greece offers a more solitary experience reminiscent of 18th-century travels, with its ruins freely roamed by sheep among minimal tourists.
5. Ostia Antica near Rome, Italy, captivates with well-preserved mosaics and structures, providing a quieter, more personal exploration compared to sites like Pompeii.

Source: https://www.atlasobscura.com/articles/ruins-worth-the-trip