Nigerians who travel out except those who travel to ECOWAS countries and to countries which have entered into visa abolition agreement with Nigeria require visa for such travel.
The requirements for business/ tourist Visa for most of the countries are similar. For Visa requirements to most of the countries with embassy in Nigeria check below, just click on the link for the particular country of your interest.
AUSTRALIA: http://nigeria.embassy.gov.au/
AUSTRIA: https://www.bmeia.gv.at/en/austrian-embassy-abuja/
BELARUS: http://nigeria.mfa.gov.by/en/
BRITAIN: https://www.gov.uk/government/world/nigeria
CANADA: http://www.canadainternational.gc.ca/nigeria/
CHINA: http://ng.chineseembassy.org/eng
BELIZE: http://www.theconsulateofbelize.org/
CZECH: http://www.mzv.cz/abuja
IRELAND: https://www.dfa.ie/irish-embassy/nigeria/
FINLAND: http://www.finlandnigeria.org/Public/Default.aspx
FRANCE: https://ng.ambafrance.org/
GERMANY: http://www.nigeria.diplo.de/
GREECE: http://www.mfa.gr/missionsabroad/en/nigeria.html
INDIA: http://hcindia-abuja.org/index.php
INDONESIA: http://www.kemlu.go.id/abuja/en/default.aspx
IRAN: http://abuja.mfa.ir/?siteid=320
IRAQI: http://mofamission.gov.iq/en/Nigeria
ISREAL: http://embassies.gov.il/abuja/Pages/default.aspx
ITALY: http://www.ambabuja.esteri.it/ambasciata_abuja/it/
JAMAICA: http://jhcnigeria.com/
JAPAN: http://www.ng.emb-japan.go.jp/itprtop_en/index.html
LABANON: http://www.abuja.mfa.gov.lb/abuja/english/home
LIBERIA: http://www.liberiaembassyabuja.org/
LIBYA: http://libyaembassynigeria.com/
MALAYSIA: http://www.kln.gov.my/web/nga_abuja/home
NAMIBIA: www.namibiahc.com.ng
NORWAY: https://www.norway.no/en/nigeria
PHILIPPINES: http://www.abujape.dfa.gov.ph/
POLAND: http://www.abuja.mfa.gov.pl/en/
ROMANIA: http://www.mae.ro/en/romanian-missions/3215
SLOVAKIA: http://www.slovak-republic.org/visa-embassies/of-slovakia/
SOUTH AFRICA: http://www.dirco.gov.za/abuja/
SWEDEN: http://www.swedenabroad.com/abuja
SWITZERLAND: https://www.eda.admin.ch/abuja
TAIWAN: http://www.roc-taiwan.org/ng_en/index.html
TANZANIA: http://tanzaniahighcommissionng.com/
THAILAND: http://www.thaiembassynigeria.com/eng/
TURKEY: http://abuja.emb.mfa.gov.tr/
UGANDA: http://www.abuja.mofa.go.ug/
UKRAINE: http://nigeria.mfa.gov.ua/en