Nico di Angelo

Empire State Building

Mount Olympus (600th Floor)

Mount Olympus sits on the mystical 600th floor of the Empire State Building. Percy visits multiple times across the series, and the final battle with Kronos takes place at its base.

Plaza Hotel

Demigod army headquarters during the Battle of Manhattan. Percy and his allies regroup here between skirmishes.

Central Park — Door of Orpheus

Door of Orpheus (Entrance to the Underworld)

One of two known entrances to the Underworld, located somewhere in Central Park. Also where Percy fights Hyperion and the parley with Prometheus takes place.

Williamsburg Bridge

The Apollo cabin defends this bridge during the Battle of Manhattan. Kronos attacks here, Annabeth is stabbed by Ethan Nakamura, and Michael Yew dies or disappears.

Camp Half-Blood

Camp Half-Blood

The Greek demigod training camp on the North Shore of Long Island. Central hub of the entire series, appearing in every book. Protected by magical borders.

Camp Jupiter

Camp Jupiter (Roman Demigod Camp)

The Roman demigod training camp located in the Berkeley Hills near the Caldecott Tunnel. Home to the Twelfth Legion Fulminata. Percy arrives here with no memory in The Son of Neptune.

Underground Rome

The Athena Parthenos Chamber

Annabeth navigates the dangerous tunnels beneath Rome alone to find the Athena Parthenos. She faces Arachne in a cavern deep underground before the floor collapses into Tartarus.

Acropolis of Athens

Acropolis (Site of the Gigantomachy)

The Acropolis and Parthenon are the site of the final battle against Gaia's giants. The demigods and gods unite here for the Gigantomachy, the climactic battle of the series.

Necromanteion of Acheron

The House of Hades (Doors of Death)

The ancient Oracle of the Dead in Epirus, Greece. The surface-side entrance to the Doors of Death. The demigods must close the Doors from both sides simultaneously.

San Juan

Reyna's hometown and the site of her backstory. Reyna and Hylla grew up near the old San Juan area before their encounter with Circe and eventual journey to Camp Jupiter.

Venice

The Argo II crew explores Venice where they battle Katobleps (death-breathing cows) in the canals and encounter the demigod farmer-god Triptolemus.

Diocletian's Palace

Palace of Diocletian

The ancient Roman palace in Split, Croatia where the demigods seek the Scepter of Diocletian. The palace holds Roman imperial power connected to the mythological world.

Evora

A stop on Reyna's shadow-travel journey with Nico and Coach Hedge as they transport the Athena Parthenos from Rome to Camp Half-Blood.

Grove of Dodona

Oracle of Dodona

An ancient grove hidden in the woods of Camp Half-Blood. Apollo must restore this Oracle as part of his trials.

Nero's Tower

The evil Emperor Nero's glass skyscraper headquarters in Midtown Manhattan. The final battle of the series takes place here as Apollo confronts both Nero and Python.