The beauty of these states lies in their capital city except in few cases maybe.
•ABUJA,FCT




The beauty of the city lies in it's excellent infrastructure.
The city is planned and was built mainly in 1980s with the objective of replacing the country's most populous city Lagos as the capital in 12 december 1991

The parks in Abuja also make the city quite beautiful.
The city is a home for several parks and green areas with the largest one being the millennium Park.

LAGOS




Lagos is the fastest growing city in Africa and in fact one of the largest, fastest growing cities in the world today. Lagos state, popularly known as “Eko” “Lag” or “Lasgidi” is one of the 36 states of Nigeria.
Lagos is also the financial and economic head of the country.

ENUGU


Enugu State is one of the 36 states in the Nigerian federation and was created in 1991 from the eastern two-thirds of Anambra State. Less formally, it is also known as the Wawa state, because the people in this area respond with ‘wa’ (used as an emphasising ‘no’) rather than ‘mba’ used in other parts of Igboland

IMO




It is named after the Imo River which flows from the uplands of the state around Okigwe into the Atlantic ocean. Imo state is located in the southeast region of Nigeria and its capital is Owerri which is its largest city.

Their is also beautiful places you can hangout as a tourist you will see places like Ogu Lake Holiday Resort, Natural Man-made Oguta * Ikeji Festival, Arondizogu Cultural * Palm Beach Holiday Resort, Awo-Amana Man-made/Natural * Zoological and Botanical Garden Nekede * Amusement Park, Owerri Zoo/Man-made

AKWA-IBOM




The state's capital is Uyo, with over 500,000 inhabitants. Akwa Ibom has an airport and two major seaports on the Atlantic Ocean with a proposed construction of a world-class seaport Ibaka Seaport at Oron. The state also boasts of a 30,000-seat ultramodern sports complex. It is shaped like the Allianz arena stadium and it has modern and world-class facilities. [4] Akwa Ibom state is also home to the Ibom E-Library, a world-class information centre.

KADUNA


The state is located at the Northern part of Nigeria's High Plains. The vegetation cover is Sudan Savannah type, characterized by scattered short trees, shrubs and grasses. The soil is mostly loamy to sandy type. A substantial amount of clay is found also.

DELTA


Delta State is named after the delta region of the River Niger. It's capital is Asaba.
Warri is the biggest commercial city in the state. Other major towns are Agbor, Ughelli, Oleh, Ozoro, Oghara, Sapele, Koko, Burutu, Okpanam and Ogwashi-ukwu. Delta State can be considered a miniature version of Nigeria, with various ethnic groups

Read more here
https://www.brubee.com.ng/2019/02/ten-beautiful-states-in-nigeria.html