Twyfelfontein in Namibia’s Kunene Region holds at least 2,500 Stone Age rock engravings on 212 sandstone slabs — Africa’s most concentrated open-air archive of San hunter-gatherer art, including therianthropic shaman figures and a remarkable image of a seal carved 100 kilometres from the nearest coast. Namibia’s first UNESCO World Heritage Site, inscribed in 2007, it lies approximately 450 km northwest of Windhoek and can only be visited with a licensed guide.

Kizhi Pogost on Kizhi Island, Lake Onega, preserves two extraordinary 18th-century wooden churches — the 22-domed Church of the Transfiguration (1714) and the 9-domed Church of the Intercession — built without iron nails using the interlocking log-joinery techniques of Karelia, now the centrepiece of an 89-building open-air museum of Russian northern wooden architecture.

Mosi-oa-Tunya / Victoria Falls, shared between Zambia and Zimbabwe on the Zambezi River, is the world’s largest waterfall by combined height and width — 108 metres high and 1,708 metres wide — with the Zambian side offering the Devil’s Pool at the lip of the drop and the Zimbabwean side the full panoramic view across the 1,708-metre curtain of water.

Delos, an uninhabited 5 km² island in the Greek Cyclades, preserves both the ancient sanctuary of Apollo — mythological birthplace of the god — and the most complete Hellenistic commercial city surviving in the Mediterranean, abandoned after twin massacres in 88 and 69 BCE left its mosaic-floored residential quarter intact beneath two thousand years of silence.

Hiraizumi’s 12th-century Buddhist temples and Pure Land gardens represent the brief, brilliant civilisation built by the Northern Fujiwara clan in the remote Tōhoku region — preserved today at Chūson-ji’s golden Konjikidō hall and the Heian garden of Mōtsu-ji, and made famous in Japanese literature by Matsuo Bashō’s haiku at Takadachi hill.

The Nanda Devi and Valley of Flowers National Parks, a UNESCO site in the Indian Himalaya, combine the permanently closed wilderness sanctuary around Nanda Devi (7,816 m) with the seasonally accessible Valley of Flowers — a high-altitude meadow holding over 500 alpine plant species and open to trekkers only between June and October.

The Ennedi Massif in northeastern Chad, a UNESCO mixed site inscribed in 2016, preserves Carboniferous sandstone eroded into vast gorge systems and natural arches, over 400 rock art sites documenting the transition from the Green Sahara to desert across 7,000 years, and the Guelta d’Archei — where the last relict Saharan crocodiles coexist with daily camel gatherings in an isolated spring deep in the desert.

The Rock Islands Southern Lagoon, a UNESCO mixed site in the Republic of Palau, encompasses 445 limestone islands with mushroom-shaped profiles, over 385 coral species, and the extraordinary Jellyfish Lake — where millions of golden jellyfish have evolved to lose their sting. The lagoon also preserves ancient Palauan cultural heritage and dozens of Second World War wrecks in its clear waters.