Imagist poem that describes "the apparition of these faces in the crowd."
One of these places in Stockholm is supposedly haunted by the Silverpilen, or "Silver Arrow", and features a huge fresco depicting a timeline of human civilization at Rissen. The first of these places in mainland Europe was built in Budapest in 1894. Hector Guimard designed several Art Nouveau-style entrances to these places, which were painted green to resemble worn-out copper. One of these places that opened at the 1900 Exposition Universelle inspired a short (*)  Imagist poem that describes "the apparition of these faces in the crowd." Harry Beck created a pioneering topological map for one of these systems that regularly reminds its visitors to "mind the gap." For 10 points, identify these public transportation systems that are usually built underground.
One of these places in Stockholm is supposedly haunted by the Silverpilen, or "Silver Arrow", and features a huge fresco depicting a timeline of human civilization at Rissen.
metro  systems [or  rapid transit  systems; or  subway  systems; or  metro station s; or  subway station s; or obvious equivalents; prompt on anything mentioning  train s] 