The original Legion HQ was a rocketship "Clubhouse" modeled after the one which brought baby Kal-El to Earth in the 20th century.
History
The three original Legionnaires talked R.J. Brande into adding several improvements to the Clubhouse such as: underground caverns, meeting rooms and providing the best crime-fighting technology that money could buy. It served as the base of operations for the Legion of Super-Heroes until it was destroyed in a battle with the Fatal Five.[1]
The next Legion HQ was a giant citadel built in Smallville, Metropolis.[2] The towering edifice has been destroyed and rebuilt many times.
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