Great hot springs on earth, in one place.

~52°C spring, SA's most accessible, resort wellness

Europe's largest alpine thermal spa, ~30 pools at 1,411m

Iron-rich orange volcanic pool in a botanical garden

Six natural ~39°C pools, open into the night

Most luxurious hot-spring resort in Arenal

Natural thermal river, silica-rich pools under Arenal volcano

Historic spa town, 13 official mineral springs, UNESCO Great Spa Town

Historic Black Forest spa town; Friedrichsbad (Roman-Irish baths) + Caracalla Therme

Largest thermal complex in Europe, neo-Baroque palace

16th-c Ottoman bath, rooftop hot tub over the Danube

Slovenia's largest thermal resort, big water park, family-oriented

Top-rated wellness resort, voted best wellness centre 8 years

Historic spa town, mineral-rich Donat healing spring

Taiwan's most famous, milky sulfur springs, MRT-accessible

Onsen resort town ~1h from Taipei, colourless odourless springs, packed with hot-spring hotels

Odorless carbonate springs in an Atayal mountain town

One of the world's few mud hot springs

Largest thermal spa in southern Europe, 6,000+ sqm

Britain's only natural thermal spa, rooftop pool over the city

37°C springs with waterfalls in a forested gorge

Antiquity spa town, thermal water flows into the Aegean

Five-star thermal spa resort over sulphur springs

Free Instagram-famous travertine cascade pools, ~37.5°C

Free pools beneath the white 'Balena Bianca' formation

Renaissance thermal pool filling the village square

UNESCO white 'cotton castle' terraces

Swim among submerged Roman columns, ~36°C

Thermal waterfalls used since pre-Roman times

Highest hot spring in Canada (1,585 m), open year-round

Canadian Rockies' largest hot springs pool

Remote coastal cascade pools by boat/floatplane

World's largest hot springs pool

One of America's oldest health resorts (1868), 11 pools

Largest US hot spring, vivid color bands; VIEW-ONLY

Free terraced pools with Sawtooth Ridge views

Restored ghost-town luxury resort, San Juan Mtns

Soak under the northern lights

Traditional bathhouse running since 1912, Hot Springs NP

Soak with views of drifting icebergs

Milky-blue silica seawater, Iceland's most famous

Oceanfront infinity geothermal pool

Iceland's oldest pool (1891), Golden Circle

North's blue-water answer to Blue Lagoon, ~half price

Forest-set geothermal baths in the north

Free warm geothermal river, ~1h hike

Large geothermal bathing complex near Melbourne

28 lakeside mineral pools, NZ's best-known thermal spa

Dig your own pool in the sand at low tide

22 outdoor pools in the Southern Alps foothills

Free natural warm creek with a small waterfall

Tokyo's closest major onsen resort, Mt Fuji views

Largest hot-spring output in Japan, the 'Hells' + sand baths

Sulfur waters fed by Jigokudani 'Hell Valley'

Historic town of seven public bathhouses

Largest natural flow in Japan, voted #1 onsen for years

Riverside slate-floored open-air pools

Taisho-era gas-lit wooden ryokan along a river

Onsen town beside the wild bathing macaques

One of Japan's three famous springs, alkaline 'beauty' water

Art-and-cafe resort town below Mt Yufu

Reputedly Japan's oldest onsen, historic bathhouse

Ancient onsen near Osaka, gold (kinsen) + silver (ginsen) waters

7 remote ryokan, milky open-air forest baths

Tiered stone pools (35-50°C) by the Mendoza River

Altiplano pool, a standard Uyuni salt-flat tour stop

17 slate pools linked by red boardwalks through rainforest

Eight canyon pools at ~3,500m in the Atacama

High-Andean spa resort ~1h from Quito, nine thermal pools, on-site lodging

Mineral pools 38-44°C, 20km from Machu Picchu; marquee Salkantay-trek stop

Sacred Sikh/Hindu pilgrimage springs, ~94°C

Sacred spring at the end of a Parvati Valley trek

Carved stone spouts in a tropical north-Bali garden