Geography.

The Netherlands' Flevoland province, reclaimed from the Zuiderzee (now IJsselmeer) starting in the 1950s, covers approximately 970 km² — the largest artificial island/reclaimed-land area in the world created by a single nation, now home to over 400,000 people on land that was open water less than a century ago.

Derinkuyu, an ancient multi-level underground city in Cappadocia, Turkey, extends approximately 85 m below the surface across at least 18 levels, with estimated capacity to shelter up to 20,000 people along with livestock and food stores — the largest known excavated underground city, likely built to provide refuge during invasions dating back over 2,000 years.

A megatsunami in Lituya Bay, Alaska, on July 9, 1958, triggered by a landslide following an earthquake, produced a wave with a maximum run-up height of approximately 524 m — stripping trees from the mountainside up to that height — the tallest wave ever scientifically documented, though its extreme localized cause (a landslide in a narrow bay) makes it very different from ocean-wide tsunamis generated by undersea earthquakes.

Oymyakon, a village in Siberia, Russia, recorded a temperature of -71.2°C in 1924 (with -67.7°C the lowest reliably measured in the modern era) — the coldest permanently inhabited place on Earth, where residents keep vehicle engines running continuously through winter to prevent them from freezing solid.

The Trans-Siberian Railway, connecting Moscow to Vladivostok, stretches approximately 9,289 km — the longest railway line in the world, crossing eight time zones and taking about a week to traverse end to end.