Turkmenistan's Darvaza gas crater has burned continuously since 1971 in a Karakum desert hole, and Ashgabat holds the highest concentration of marble buildings on Earth in a Turkmenistan-only megaproject capital.
Pre-summer with Karakum desert daytime walks pleasant, Darvaza crater photogenic in cool air, and Ashgabat's marble city dazzling under spring light.
Karakum hits 45°C and the Darvaza crater impossibly hot to approach, but Ashgabat's air-conditioned marble lobbies remain spotless and accessible.
Desert cooling, Darvaza visible from a kilometre away, and Merv archaeological site accessible without summer's punishing heat.
Cold desert winters with snow possible at Konye-Urgench, Ashgabat's marble plazas eerily empty, and visa restrictions remain among the strictest globally.