A list of the highest, tallest, largest, oldest, etc. places that I’ve been for both personal and world bests:
Directional
Northernmost: Ivalo, Finland (68°N, above the Arctic Circle)
Southernmost: Port Arthur, Tasmania, Australia (43°S)
Closest to the Equator: Singapore (1°N)
Elevation
Highest Elevation: Laguna 69, Áncash Region, Huasacarán National Park in the Cordillera Blanca Mountain Range, Peru (15,100 ft / 4,605 m)
Lowest Elevation (on land): New Orleans, Louisiana, USA (-7 ft / -2 m);
(in ocean): Great Barrier Reef, Queensland, Australia (-80 ft / -25 m)
Distance / Travel Time
Greatest Distance Traveled: Around the World in 30 days = 25,753 miles / 41,444 km
Longest Travel Time / Most Connections: 28+ hours flight time (35+ hours total travel time) / 6 connections = Chiang Mai > Bangkok > Sydney > Brisbane > Los Angeles > Philadelphia (15,060 miles / 24,235 km)
Highest / Tallest
Tallest Mountain: Mt. Everest, Nepal* (seen from plane);
Dhaulagiri (7th tallest) and Annapurna I (10th tallest) (seen in range);
Tallest from sea floor: Mauna Kea, Hawai’i, USA*
Tallest Building: Burj Khalifa, Dubai, UAE*
Tallest Waterfall: Gocta Cataracts, Peru (5th in world, disputed)
Highest Capital City & Highest International Airport: La Paz/El Alto Airport, Bolivia* (13,323 ft / 4,060 meters)
Deepest
Deepest Lake: Crater Lake, Oregon, USA (9th in the World, 2nd in N. America)
Oldest
Oldest Structure: Stone Circle, Scotland (~900 BCE)
Smallest
Smallest Country: Vatican City*
Smallest City: Vatican City* (smallest by area)
Biggest (Nature)
Largest Mountain & Largest/Most Active Volcano: Mauna Loa, Hawai’i, USA* (largest in mass/volume)
Largest Waterfall: Mosi-oa-Tunya / Victoria Falls, Zambia & Zimbabwe* (largest sheet of falling water)
Largest Salt Flats: Salar de Uyuni, Bolivia*
Largest Tropical Lake: Lake Victoria, Tanzania* (and 2nd largest fresh water lake)
Biggest (Non-Commercial)
Largest City: Tokyo, Japan* (largest urban area)
Largest Church: St. Peter’s Basilica, Vatican City*
Largest Gothic Cathedral: Seville Cathedral* (3rd largest cathedral in world, disputed)
Largest Temple: Angkor Wat, Siem Reap, Cambodia*
Biggest (Commercial)
Largest Museum: Smithsonian Institutes, Washington DC, USA*
Largest Zoo: Berlin Zoo & Gardens, Germany*
Largest Mall: The Dubai Mall* (largest total area)
* First in the world, within respective category