During the day, your legs will get a workout wandering the streets and exploring the massive fortress overlooking the city.

The castle has never been conquered, probably because of the location and the massive fortress.

It's a massive fortress, a stronghold, where wizards used to live.

The present keeps were the central point of a massive fortress.

Beyond it, he could see the solemn, massive fortress that was the Coven's haven.

The commanders reside within a massive aerial fortress known as the "mobile command center".

The agent looked out the window at the massive gray fortress of Leavenworth Prison.

They built the massive fortress, Sacsayhuamán, during the 12th century.

Archaeological excavations in the 1990s discovered a massive fortress, built around a thousand years ago.

Seen suddenly at close vision, isolated like that from the rest of the island, it looked like some massive medieval fortress.