In contrast to Themyscira, only men were allowed to set foot on Thalarion, and only those who had the permission of the Olympians. All others were killed on sight. By Zeus' decree, only Athena, goddess of wisdom was the only woman permitted to visit Thalarion.
The central city was forged entirely out of crystal so that there would be no secrets from its occupants. A river of molten gold flowed through the city so that each Olympian could share in its wealth and there would never be a need for jealousy.
One of the more renowned residents of Thalarion was Jason, the fame Argonaut who sailed with Heracles upon the Argo centuries ago. Jason was the leader of the Olympian army.