Google Earth default USA center in LAWRENCE, KANSAS
Input Lat,Lng:  38.95939,    -95.2654831
Computed GeoHash: 9yum8hmfckejz2up6
Lat,Lng from GeoHash: 38.95939,-95.2654831

Washington Monument
Input Lat,Lng:  38.8894838,  -77.0352791
Computed GeoHash: dqcjpp8eevhx43ezy
Lat,Lng from GeoHash: 38.8894838,-77.0352791

Post Office 15213 in Pittsburgh
Input Lat,Lng:  40.4401766,  -79.9526167
Computed GeoHash: dppnh9um0grczv3sd
Lat,Lng from GeoHash: 40.4401766,-79.9526167

Ivy City Smokehouse in DC
Input Lat,Lng:  38.9146348,  -76.9855517
Computed GeoHash: dqcm2hhy4tsn87ek7
Lat,Lng from GeoHash: 38.9146348,-76.9855517

Seatac Airport, according to Google
Input Lat,Lng:  47.4502535, -122.3110052
Computed GeoHash: c23jbwpcg0273qes6
Lat,Lng from GeoHash: 47.4502535,-122.3110052

Eiffel Tower, Paris
Input Lat,Lng:  48.8583701,    2.2944813
Computed GeoHash: u09tunqu9k360m5s0
Lat,Lng from GeoHash: 48.8583701,2.2944813

Sydney Opera House
Input Lat,Lng: -33.8567844,  151.2152966
Computed GeoHash: r3gx2ux9gvcqpxxry
Lat,Lng from GeoHash: -33.8567844,151.2152966

Obelisco de Buenos Aires
Input Lat,Lng: -34.6037389,  -58.3815703
Computed GeoHash: 69y7pkxfdg9cpdbkt
Lat,Lng from GeoHash: -34.6037389,-58.3815703

Merlion, Marina Bay, Singapore
Input Lat,Lng:   1.286833,   103.8545280
Computed GeoHash: w21z76283ghcfg1hj
Lat,Lng from GeoHash: 1.286833,103.854528

La Basilica del Voto Nacional, Quito, Ecuador
Input Lat,Lng:  -0.2144375,  -78.5071875
Computed GeoHash: 6rbnv8byccyn7ztd7
Lat,Lng from GeoHash: -0.2144375,-78.5071875

Mu Pagoa Waterfall, Puleia Samoa
Input Lat,Lng: -13.7768121, -172.3786318
Computed GeoHash: 2jt3tkj8qb048wx1d
Lat,Lng from GeoHash: -13.7768121,-172.3786318

My house in McLean, Virginia
Input Lat,Lng:  38.9304478,  -77.1480894
Computed GeoHash: dqcjkrn6r1rngf8sc
Lat,Lng from GeoHash: 38.9304478,-77.1480894

Not exactly my house in McLean, Virginia
Input Lat,Lng:  38.9,        -77.1
Computed GeoHash: dqcjm
Lat,Lng from GeoHash: 38.9,-77.11