In 1910, when New York City transportation terminal Pennsylvania Station opened, it was widely praised for its majestic architecture. Designed in the Beaux-Arts style, it featured pink granite construction and a stately colonnade on the exterior. The main waiting room, inspired by the Roman Baths of Caracalla, was the largest indoor space in the city — a block and a half long with vaulted glass windows soaring 150 feet over a sun-drenched chamber. Beyond that, trains emerged from bedrock to deposit passengers on a concourse lit by an arching glass and steel greenhouse roof.This may sound unfamiliar for present-day residents of New York City, who know Penn Station as a miserable subterranean labyrinth.

Source: What Penn Station used to look like will make you weep with longing