Not bad by age 30
ROAD
USA/Canada
USA/Mexico
Poland/Germany
Poland/Slovakia
Poland/Czech Republic
Poland/Ukraine
Slovakia/Hungary
Hungary/Ukraine
Finland/Russia
Belarus/Poland
Greece/Albania
Albania/Macedonia
Macedonia/Bulgaria
Germany/Netherlands
Germany/Denmark
Austria/Slovakia
Croatia/Bosnia
Switzerland/Liechtenstein
France/Switzerland
Italy/San Marino
Poland/Lithuania
Lithuania/Latvia
Turkey/Syria
Syria/Jordan
Guatemala/Honduras
Brazil/Argentina
Argentina/Paraguay
Paraguay/Brazil
Argentina/Bolivia
Bolivia/Peru
Guatemala/Belize
Belize/Mexico
Singapore/Malaysia
Malaysia/Brunei
Laos/Vietnam
Vietnam/Cambodia
Cambodia/Thailand
Botswana/Namibia
Kenya/Tanzania
Tanzania/Malawi
Malawi/Zambia
Zambia/Zimbabwe
Namibia/South Africa
BY RAIL
Canada/USA
Poland/Germany
Netherlands/Belgium
Poland/Slovakia
Germany/Netherlands
Slovakia/Hungary
Austria/Germany
Germany/Belgium
Belgium/France
Belgium/Luxembourg
Germany/Czech Rep
Germany/Switzerland
France/Switzerland
France/Spain
Hungary/Serbia
Serbia/Montenegro
France/Italy
France/Monaco
Bulgaria/Romania
Singapore/Malaysia
Malaysia/Thailand
FERRY/BOAT
Mexico/USA (cruise)
Finland/Estonia (ferry)
UK/Denmark (ferry)
Denmark/Sweden (ferry)
Sweden/Finland (ferry)
Italy/Greece (ferry)
UK/Ireland (ferry)
Jordan/Egypt (ferry)
Hong Kong/Macao (ferry)
Thailand/Laos (river cruise)
Argentina/Uruguay (ferry)
Namibia/Angola (boat)
Zambia/Botswana (ferry)
ON FOOT
Italy/Vatican
Mexico/USA (Tijuana)
Macao/China
Spain/Gibraltar
Zambia/Zimbabwe
Montenegro/Croatia