The first Zamenhof-Esperanto object was the ship Esperanto, constructed and launched in Spain in 1896, nine years after the language's birth. The 1934 Encyclopedia of Esperanto listed approximately 50 towns and cities in which Esperanto or Zamenhof have been honored. In 1997, a German Esperantist, Hugo Röllinger, published a book titled Monumente pri Esperanto – ilustrita dokumentaro pri 1044 Zamenhof/Esperanto-objektoj en 54 landoj ("Monumentally about Esperanto – an illustrated documentary of 1,044 Zamenhof-Esperanto objects in 54 countries") and until his death in 2001 he listed a total of 1,260 such objects.^[1] It is he who coined the acronym ZEO. Currently, Robert Kamiński of Poland is the person charged with the registration of ZEOs by the Universal Esperanto Association.^[2]

• Tallest
  • At 12 meters, the Zamenhof monument in Sabadell, Spain, dating from 1989
• Longest
  • At 4 kilometers, Esperanto Street in São Sebastião do Caí, Brazil
• Northernmost
  • A monument to Esperanto in Narvik, Norway, at 68°25' N
  • Esperanto Creek in Alaska, United States, at 63°27' N
  • Cape Esperanto, Svalbard, Norway, at 78°37' N
• Southernmost
  • Esperanto tree in Tasmania, Australia, at 42° S
  • Zamenhof monument and Esperanto Street in Mar del Plata, Argentina
  • Zamenhof street in Port Elizabeth, South Africa
  • Esperanto Island, Antarctica, at 62°25'43" S
• Most remote
  • The asteroids 1462 Zamenhof and 1421 Esperanto
  • An inscription in Esperanto carried by the Voyager 1 and Voyager 2 spacecraft on their journey out of the Solar System

• Esperanto culture

• List of ZEOs recorded in Röllinger's 1997 book
• List and images of postal stamps on the topic of Esperanto
• Information about ships named after Esperanto and Zamenhof