The explosion of mobile data traffic calls for new efficient 5G technologies beyond what current 4G LTE can provide. Massive MIMO, which has shown the great potential in improving the achievable rate with a very large number of antennas, becomes a popular candidate. However, several critical challenges in designing the analog front-end and coordinating the large-scale antenna array have to be carefully addressed before the massive MIMO can be actually adopted. Therefore, a natural question to ask is: does there exist a good alternative that can achieve similar system performance to massive MIMO with a simpler design? In this paper, we show that by using time-reversal approach, with a sufficiently large bandwidth, one can harvest massive multipath naturally existing in the environment to form high number of virtual antennas to achieve the desired massive MIMO effect with a single antenna. We answer the above question by analyzing the time-reversal massive multipath effect (TRMME) and the achievable rate with different signature waveforms. We also derive the corresponding asymptotic achievable rate under a massive multipath setting. Experiment result based on real channel measurements shows the approach to realize the massive multipaths in practical environment. Moreover, based on our experiment with real indoor measurement, even with only a single antenna, the time-reversal wideband system can achieve comparable performance as the massive MIMO system in terms of expected achievable rate.