The Alishan Forest Railway was completed in 1912, built during the Japanese colonial period to extract the enormous cypress trees that covered the mountains. It remains one of the few mountain narrow-gauge railways in the world still in active passenger service — a 71.6-kilometer line that climbs from Chiayi at roughly 30 meters elevation to Alishan station at 2,216 meters, passing through 50 tunnels and over 77 bridges. The engineering was remarkable for its era; much of the infrastructure is largely unchanged from the prewar period. The loggers who built the railway were efficient: they took most of the old-growth forest. What they left behind — the trees too gnarled or irregular or massive to be worth cutting — became, over the following century, Alishan's most remarkable monuments. The Japanese designated the area a national park in 1937, in part because what remained was still extraordinary. Logging largely ceased by the 1970s. In 2001, the whole area was declared a national scenic area.

The dominant trees of Alishan are Taiwanese red cypresses (Chamaecyparis formosensis), and the ones that survived the colonial logging have been growing for well over 2,000 years. Walking among them is a different experience from other forests: the trees are not simply large but complexly shaped — fused, twisted, hollow in places, draped in green moss that covers every surface not touched by direct light. The loggers spared the most irregular specimens because they were commercially useless; these are now the most striking trees in the park, given names like "Elephant Trunk" or "Three Generation Tree" by the trails that wind past them. In spring, cherry blossoms draw enormous crowds; in summer, orange montbretia blooms cover the slopes. The climate shifts with elevation — bananas and palms at the base, evergreens and mist at the top — and the moss-drenched humidity at altitude gives the forests a quality closer to a temperate rainforest than a mountain park.

Alishan's weather has a theatrical quality. A typical day starts clear, sometimes brilliantly so, with the full view of Yushan available in the early morning. By midday, clouds roll in from the valleys with a speed that feels intentional, and the park disappears into dense white mist. By late afternoon or evening, rain arrives — sometimes in torrents, sometimes with lightning. Then the cycle resets. This pattern is predictable enough that the famous sea of clouds — the rolling white carpet filling the valleys below the ridgeline — is a regular feature rather than a lucky occurrence. The highest peak within the scenic area, Datashan, reaches 2,663 meters. In summer, Alishan offers relief from the heat of the coast; it averages 10 degrees Celsius cooler than Chiayi below. Snow falls occasionally in winter, but is not reliable. Rain is always a reasonable expectation.

Taking the Alishan Forest Railway from Chiayi is not the fastest way to arrive, but it is emphatically the right one for anyone who wants to understand what this place is. A one-way ticket costs NT$399 and the journey takes approximately five hours upward, passing through the mid-mountain town of Fenqihu roughly halfway — where the famous railway bento boxes are sold from platform vendors — and continuing through tunnels, spirals, and switchbacks engineered to manage a gradient that buses address more bluntly. Inside the park, three smaller railway lines connect the main village and hotel area to the popular sunrise viewpoint at Jhushan station, the old-growth forest trails near Zhaoping, and the Sister Ponds. The trails themselves are well-maintained boardwalks and paved paths, signed in Chinese, English, and Japanese, with maps at every junction. For those staying overnight, the park is quieter in the late afternoon than at any point during the day — the day-trip crowds have gone, and the mist has settled.

Alishan produces what many consider Taiwan's finest oolong tea. The High Mountain Oolong (Gaoshan Wulong) grown on the slopes below the park benefits from high elevation, persistent mist, and cool temperatures — conditions that slow the growth of the tea leaves and concentrate their flavor. Tea plantations are visible on the descent toward Fenqihu and on the slopes around nearby Shizhuo. In the park's village, tea shops will steep a pot of several varieties and let you taste before buying; the ritual is as much part of the experience as the tea itself. Mountain produce more broadly — wasabi grown at altitude, cookies and pastries flavored with ashitaba (a Japanese herb with the name meaning "tomorrow leaf"), carvings and handicrafts in red cypress — fill the shops around the main village. The restaurants specialize in mountain hotpot, using wild vegetables and game from the surrounding hills.